A condition, known commonly as "black urine disease" or Alkaptonuria is a rare genetic disorder involving protein metabolism, and it has its root in the mutation of the homogentisate 1,2-dioxygenase gene, which in turn causes homogentisic acid accumulation in the body. The appearance of dark urine after exposure to air is due to this kind of accumulation; however, a variety of symptoms can be expected, such as joint stiffness, changes in pigmentation, and other long-term health complications. Although the prevalence has been estimated to be between 1 in 250,000 and 1 in 1 million people in the United States, its effects are indeed high on those affected.

Alkaptonuria is an autosomal recessive disease, meaning that the child must inherit a defective copy of the HGD gene from both parents. If both parents are carriers, their offspring have a 25% chance of inheriting two faulty genes and developing alkaptonuria. The condition is genetic but is often not diagnosed for years because it progresses slowly and its early symptoms appear to be harmless.

Symptoms of Alkaptonuria

The most characteristic and common initial symptom of alkaptonuria is dark urine. The reason for this is due to the fact that excess HGA is excreted in the urine and upon oxidation in the presence of air, it gives the urine a brown or black color. Though it is often considered cosmetic, the long-term accumulation of HGA within the connective tissues produces more complicated health problems.

Progressive joint pain and stiffness: The accumulation of HGA in cartilage leads to early-onset osteoarthritis, making movement increasingly difficult over time.

Skin and eye pigmentation changes: Affected individuals may develop bluish or grayish discoloration of the sclera (white part of the eye) and the skin, particularly in areas exposed to friction.

Cardiovascular and respiratory problems: With age, HGA accumulation can lead to valve calcifications in the heart and stiffening of connective tissues in the respiratory tract, which can cause problems in middle and old age.

Decreased mobility and spinal problems: The spine may become stiff and painful due to chronic cartilage degeneration.

These symptoms usually begin to manifest during adulthood, leading to severe complications in a person's 40s or 50s and significantly affecting the quality of their life.

How is Alkaptonuria Diagnosed?

Because of its rarity, alkaptonuria is often mistaken or overlooked early in life. However, there are several ways to confirm the condition:

Urine Testing: The gold standard in the diagnosis is the testing of urine samples for high levels of homogentisic acid via gas chromatography. In case of oxidation, which changes the color of urine to black, it is indicative of alkaptonuria.

Genetic Testing: Confirmatory genetic testing reveals mutations of the HGD gene to diagnose the condition conclusively.

Blood Tests: High levels of HGA in the blood can be used as further evidence.

Imaging Studies: X-rays and MRIs will expose cartilage and joint damage characteristic of alkaptonuria.

Management of Alkaptonuria: Is There A Cure?

At present, there is no cure for alkaptonuria; however, various treatment approaches can reduce its symptoms and slow the disease's progress:

Nitisinone Therapy: Nitisinone is a drug that inhibits the production of HGA. It has been shown to reduce HGA levels and slow tissue damage. However, it needs to be taken under close medical supervision because of potential side effects.

Low-Protein Diet: Since HGA is a byproduct of protein metabolism, reducing protein intake—especially foods rich in tyrosine and phenylalanine—may help decrease HGA production.

Pain Management: OTC pain relievers and anti-inflammatory medications can be used to relieve joint pain and stiffness.

Physical Therapy: Exercise regularly, as it may improve mobility and strengthen muscles, thus reducing strain on affected joints.

Surgical Interventions: Most people with alkaptonuria develop severe osteoarthritis necessitating joint replacement in their old age. Also, some may require heart valve replacement surgery if cardiovascular complications develop.

Life with Alkaptonuria

Although alkaptonuria is not fatal, it severely affects the quality of life. The progressive deterioration of the joints and associated symptoms can make everyday activities difficult, requiring lifestyle changes and medical interventions. The disease may cause premature aging of the joints, requiring walking aids and mobility assistance earlier than expected.

Ongoing research will continue to work on improving the treatment options by focusing on gene therapy and alternative enzyme replacement therapies. However, because of its rarity, the clinical trials and research remain sparse.

As genetic research advances, more hope for better management and possible curative approaches for alkaptonuria exists. Scientists are searching extensively for enzyme replacement therapies and innovative drugs that can target the root cause of the disorder. Being aware and being diagnosed early helps individuals better their condition and ultimately have better long-term health outcomes.

Alkaptonuria is a striking example of how one gene mutation can have widespread effects on the body. Though still a rare and often misunderstood condition, growing awareness and advances in treatment are paving the way for better care. If you or a loved one suspect symptoms of alkaptonuria, it is essential to seek early diagnosis and medical guidance to manage the disease effectively and preserve quality of life.

As summer heat intensifies both in India and globally, many people may experience unusual heart sensations such as a racing heartbeat, chest fluttering, skipped beats, or pounding sensations, even while resting.

Speaking to HealthandMe, Dr. L.K. Jha, Associate Director and Head Unit-II, Cardiology, Asian Hospital, Faridabad, said that heatwaves can significantly increase the risk of heart palpitations.

Normal healthy people may experience occasional mild palpitations due to heat exposure, which usually resolve with rest, fluids, and cooling off. However, experts warn that when palpitations are accompanied by symptoms such as chest pain, loss of consciousness, shortness of breath, extreme light-headedness, or recurring episodes while resting, they may indicate an underlying cardiac rhythm issue requiring medical attention.

“The association between heatwaves and palpitations occurs more frequently than people think,” Dr. Jha said.

Dehydration: A Key Risk Factor

The human body constantly works to maintain a stable internal temperature.

During extreme heat, blood vessels dilate to release heat through the skin, while the heart pumps faster to circulate blood and cool the body. According to Dr. Jha, this additional strain on the cardiovascular system can make the heartbeat feel stronger or irregular, especially in people sensitive to heat.

Dr. Jha explained that dehydration is one of the biggest contributors to heat-related palpitations.

Excessive sweating leads to the loss of water and essential electrolytes such as sodium, potassium, and magnesium, all of which are crucial for maintaining a normal heart rhythm.

“Dehydration can lower blood pressure, forcing the heart to beat faster, which may cause dizziness, shakiness, or pounding sensations,” he said.

Existing Health Conditions Can Increase Risk

Heatwaves may also worsen existing conditions such as anxiety, thyroid disorders, anemia, diabetes, and heart disease, increasing the likelihood of palpitations.

Certain medications, including blood pressure drugs, diuretics, asthma inhalers, as well as excessive consumption of caffeine or energy drinks, may further contribute to irregular heartbeats during hot weather, Dr. Jha told HealthandMe.

Sleep disturbances caused by hot nights can also trigger stress hormones in the body, potentially leading to rapid heartbeat episodes or fluttering sensations.

When To Seek Medical Help?

Dr. Jha noted that occasional mild palpitations due to heat exposure are common and often improve with rest, hydration, and cooling down.

Doctors recommend drinking fluids regularly, replenishing electrolytes through coconut water, buttermilk, lemon water, or Oral Rehydration Salts (ORS), avoiding prolonged sun exposure, and limiting caffeine and alcohol intake during heatwaves.

However, persistent or severe palpitations may indicate a more serious condition.

“If palpitations are accompanied by chest pain, shortness of breath, fainting, severe light-headedness, or repeated episodes while resting, immediate medical evaluation is necessary,” Dr. Jha warned.

He added that some heat-related palpitations may actually signal an underlying heart rhythm disorder requiring treatment.

Yellow Alert In Delhi; Heat Dome in Europe

Meanwhile, the India Meteorological Department (IMD) has issued a yellow alert for heatwave conditions in Delhi.

Heatwave conditions in the national capital are expected to continue till tomorrow, with maximum temperatures remaining between 44 and 46 degrees Celsius.

The IMD forecast also includes relief in the form of thunderstorms, dust storms, and light rainfall from May 28 evening onwards.

At the same time,European countries like France, the United Kingdom, Spain, and Germany are experiencing early heatwaves and record-breaking conditions.

The sweltering heat conditions have affected scores of people, reportedly resulting in the deaths of about seven people in France. The unusually high temperatures early in May are being triggered by a phenomenon called a “heat dome”.

As a result, southern and southwestern regions, including Portugal, Spain, and France, will experience daytime temperature highs of 38°C. The majority of France is under a moderate to high temperature warning, while Germany and the UK are witnessing maximum temperatures exceeding 30°C, the Euronews reported.

The human body thrives on essential metals, but excessive exposure can cause a variety of issues for them in the long run, and this very fact has come to light in a recent study done by a research team at the Icahn School of Medicine at Mount Sinai Hospital. The paper reveals the detrimental impact of getting exposed to toxic metals early in life.

Drs. Manish Arora, Elza Rechtman, and Megan Horton at the Icahn School of Medicine at Mount Sinai Hospital thoroughly studied the mental effects in infants after early exposure to toxic metals. The study was published in Science Advances.

The research team studied the teeth of 489 infants aged 8 to 14 years old. As teeth grow in layers, and each layer can provide data on metal exposure, the researchers measured exposure to lead, lithium, barium, copper, manganese, magnesium, tin, zinc, and strontium.

The study also monitored 395 children for symptoms relating to anxiety, depression, hyperactivity, and attention, and magnetic resonance imaging (MRI) was used to examine 191 children.

Metals like zinc, magnesium, and manganese are very important for growth and health, but overexposure to these metals in children can cause harm.

Childhood is the time for mental growth in children, but this is the same time span when they get exposed to toxic metals as well. From food to inhaling tobacco smoke or exposure through touch, there are many ways a child gets near those adversarial metals and causes harm to themselves.

The results of the study show that exposure to heavy metals mainly happens between 6 and 9 months after birth. They also claim that the excessive metal exposures during key periods of brain development can have long-lasting effects.

Also Read: How To Get Rid Of Heavy Metals In Your Body?

How To Detox From Heavy Metals?

Reducing exposure to heavy metals can be achieved through simple lifestyle and dietary changes. This includes switching to greener diets and replacing household products. High-quality fish can help minimize mercury ingestion, while cilantro, seaweed, and leafy greens are known to trap and remove toxins from the body. Aluminium-free deodorants and titanium-free makeup and toothpaste are also recommended.

For a more intensive detox, using high-quality supplements alongside drinking at least two litres of water daily can help flush heavy metals. Armistead explains that these supplements aid the body in moving heavy metals from cells to the lymphatic system, which then transports them into the bloodstream for filtration by the liver and kidneys. The toxins are ultimately excreted via urine or bowels.

Even as climate change is driving mosquitoes north, a new study warned that Europe and North America can be new hotspots for the chikungunya virus.

Alarmingly, the research indicated that 139 countries face risk, covering 21.26 per cent of global land area for chikungunya, a mosquito-borne viral disease.

Further, the findings published in the journal Frontiers in Cellular and Infection Microbiology suggest that climate-driven vector expansion has significantly broadened the geographic scope of the CHIKV threat.

“We show that under climate change models, the virus will further expand northward into temperate regions, especially northeastern North America, central Europe, and East Asia,” said Dr Ye Xu, from Zhejiang Chinese Medical University, China.

Chikungunya is a viral illness transmitted to humans primarily through the bite of infected Aedes aegypti and Aedes albopictus mosquitoes.

How Climate Is Linked To Mosquito Behavior?

Also Read: Climate Change Fueled Rising Salmonella Drug Resistance Over Decades: The Lancet Study

As the primary vectors of chikungunya, Aedes aegypti and Aedes albopictus are highly influenced by climate conditions.

These mosquitoes thrive in warm and humid environments, with temperature playing a major role in their breeding, survival, and ability to spread the virus.

The rising temperatures can accelerate larval development, increase mosquito reproduction, and shorten the virus’s incubation period inside the mosquito, making transmission more efficient.

In the study, the researchers explained that stable temperature patterns and seasonal variations are especially important for Aedes aegypti. The species is highly sensitive to colder temperatures, with egg hatching rates dropping significantly at around 12°C. This limits how far the mosquito can spread into cooler regions.

However, climate change and warming temperatures are making previously unsuitable regions in Europe and North America more favorable for these mosquito species, raising concerns about the growing risk of chikungunya outbreaks, the team said.

“Because this mosquito can tolerate cooler conditions better than the yellow fever mosquito, warming may allow it to establish in places that used to be too cold,” said Dr Yang Wu, Guangzhou Customs Technology Center, China.

“When suitable mosquitoes become established, the chance of local chikungunya transmission increases.”

Global Chikungunya Cases

Read More: 16 Million Indians Die Due To Hypertension Every Year: AIIMS Doc

In 2025, there were 502,264 reported chikungunya cases globally, accounting for 186 deaths across 41 countries and territories, according to the Pan American Health Organization.

This disease burden is projected to escalate under climate change, which is profoundly altering the distribution patterns of infectious diseases, the researchers noted.

“The public does not need to panic, but health systems should prepare early,” warned Dr Xu.

The researchers recommended that these regions implement proactive entomological surveillance and adaptive public health infrastructure by 2040 to mitigate the threat of emerging arboviral epidemics.

Among the proposed measures, researchers include

• tracking mosquitoes,
• training healthcare workers to quickly recognise the virus,
• strengthening mosquito control,
• setting up rapid-response plans before outbreaks occur.

Chikungunya Symptoms You Should Know

Most symptoms are generally self-limiting and last for 2–3 days. The disease is characterized by

• an abrupt onset of fever,
• joint pain
• muscle pain,
• headache,
• nausea,
• fatigue
• rash.