We have all seen movies where right before the hero starts fighting, he cracks his knuckles and makes it look like the coolest thing in the world! But then our parents told us that you should not crack your knuckles because that weakens your grip and hand strength. But is that true? While many people do say that they experience a small loss in strength immediately after they crack their knuckles, but are their long-term effects to it? And what is the sound actually coming from?

The reason why people crack their fingers is because the evident and sharp crack noise causes a sense of relief. Many people also do it when they have done an activity that required them to work with their hands a lot like typing or sewing, giving themselves a sense of satisfaction, similar to stretching after doing hard work. That "crack" sound can make some people cringe, while others find it strangely satisfying. Cracking your knuckles is a pretty common habit, but there are a lot of misunderstandings about it. Some people do it without even thinking, others can't stand the noise, and some can't crack their knuckles at all. You might have been told as a kid that it causes arthritis or makes your fingers swell up. But those are just old wives' tales. There's a real science behind this habit, and it's more interesting than you may think.

Why Do Knuckles Make That Popping Sound?

The "crack" isn't actually bones breaking or anything bad happening to your joints. It's a normal thing called "crepitus." This just means harmless popping, snapping, or grinding sounds that come from your joints. The main reason you hear this sound is because of gas bubbles in the fluid that cushions your joints. This fluid is called synovial fluid. When you move or stretch, these tiny bubbles form and then pop, making the sound. It's totally normal and doesn't hurt you. Sometimes, especially in bigger joints like your knees, shoulders, or ankles, the sound can also happen when the stretchy tissues that connect your bones (ligaments and tendons) move slightly and then snap back into place.

After you crack your knuckles, you can't usually do it again right away. You have to wait a bit. That's because the gas bubbles in your joint fluid have already popped, and it takes a little while for them to build up again. While cracking your knuckles doesn't give you arthritis, doing it too much might cause some problems. Doctors say that cracking them too often could make your joints a little wobbly and might even make your grip weaker. Also, if the stretchy tissues in your joints keep snapping over your bones, they can get irritated and sore.

When Joint Popping Might Mean Something More

Sometimes, a pop in your joint is just like cracking your knuckles, nothing to worry about. But other times, it can be a sign of something else. As we get older, the cushiony stuff in our joints, called cartilage, can start to wear down. This cartilage helps your bones move smoothly. When it gets thin or uneven, the bones can rub together, and that can make a grinding or popping sound. This is different from the pop you get from gas bubbles. If this grinding sound happens along with pain, it could be a sign of osteoarthritis. This is a type of joint problem that's more common in older people, but younger people can get it too, especially after a joint injury. If your joints hurt, especially in the morning or after you've been sitting still for a while, feel wobbly, or are hard to move, it's a good idea to see a doctor.

From physical problems like fatigue and vision problems, people who survive the deadly bacterial meningitis are likely to live with long-term fatigue and vision problems, as well as be at high risk of suicide, according to a new study.

The study comes as the UK is experiencing an outbreak of meningitis in Kent, that began among students who visited Club Chemistry in Canterbury between March 5 and 7.

Although bacterial meningitis is treatable, it requires prompt, often immediate treatment for better recovery. Yet patients are likely to face the risk of fatal or long-term complications -- from physical, psychological, and social impacts, said researchers from the University of Otago, The Conversation reported.

The new findings, based on 16 cases from New Zealand, who reportedly suffered the fatal disease, showed that multiple chronic after-effects is permanent in some, while in others, it dragged on for years. The effects include:

• fatigue,
• difficulties with concentration,
• memory and emotional regulation,
• persistent headaches,
• issues with mobility, vision, and hearing.

• anxiety,
• depression
• suicidality.

"Our findings demonstrate that bacterial meningitis is much more than a life-threatening infection. It is an acute disease with serious, chronic after-effects which are poorly understood and often go unrecognised," the researchers said.

Kent Meningitis Outbreak

The bug that causes the infection has been identified as the known strain of meningitis B, and MenB vaccines will be offered to 5,000 students living in the University of Kent halls of residence in Canterbury.

Meanwhile, the UKHSA chief executive, Susan Hopkins, said the outbreak "looks like a super-spreader" event with "ongoing spread" through universities' halls of residence.

"There will have been some parties, particularly around this, so there will have been lots of social mixing. I can't yet say where the initial infection came from, how it's got into this cohort, and why it's created such an explosive amount of infections," she added.

As per Trish Mannes, UKHSA Regional Deputy Director for the South East, even after two doses, the MenB vaccine “does not protect against all strains of meningococcal disease, nor against all infections that can cause meningitis. It also does not prevent the bacteria from being carried and spread in the community”.

The UKHSA thus warned people to be aware of the signs and symptoms of invasive meningococcal disease, and to seek immediate medical attention if they or anyone they know develops these signs and symptoms.

Common symptoms include:

• rash
• sudden onset of high fever
• severe and worsening headache
• vomiting and diarrhea
• joint and muscle pain
• seizures.

Being tall can have its advantages, but a new genetic study linked height with significant health problems, such as a higher risk of developing heart disease and endometriosis throughout one's lifetime.

While genetics and environmental factors together influence a person’s height, the stature can also prove to be a risk factor for determining the risk of atrial fibrillation, which occurs when the heart quivers rapidly and erratically instead of beating regularly, said the researchers from the China Medical University Hospital in Taiwan.

“By integrating genetic data across multiple East Asian biobanks, we show that the genetics of stature is linked not only to growth-related traits but also to clinically relevant outcomes—most notably atrial fibrillation and endometriosis," said the team in the paper.

"These results suggest that stature-related polygenic scores could help improve early risk stratification in East Asian populations,” they added.

Also read: Woman Left Medically Infertile After Seven Surgeries For Endometriosis That She Did Not Have

Key Findings

The team led by Fuu-Jen Tsai conducted a large-scale genetic analysis on people of East Asian origin. They analyzed 120,000 Han Taiwanese individuals and compared them with 27,966 controls with familial short stature (FSS) -- a harmless condition where people are short due to inherited genetics -- to find genetic factors.

The study also linked a person’s height to overall body size and lung function, as well as cardiovascular traits and reproductive traits, including the age when menstruation starts.

Their findings, published in the journal PLOS Genetics, identified 293 genetic variants linked to height and five linked to familial short stature.

The genetic variants responsible for tall stature increased the risks of both atrial fibrillation and endometriosis. In comparison, the genetic factors for short statures offered a slight protection against endometriosis.

The results proved that taller stature increased the risk of atrial fibrillation independently. But the risk of endometriosis was determined through menarche/weight in taller people.

The Role Of Estrogen

A 2020 study from Denmark shares a possible explanation for the link between height and increased risk of atrial fibrillation: the rising estrogen levels.

Estrogen is a hormone known to promote the growth of the lining of the womb and is also believed to play a role in growth spurts during puberty.

The study, published in the Annals of Human Biology, showed that taller and slim girls in childhood had a high risk of developing endometriosis. The study also marked a lower body mass index as an increased risk of endometriosis.

However, further research is needed to validate these associations and inform clinical applications.

Early monitoring among younger populations has been the primary focus of the recently released American Heart Association (AHA) 2026 cholesterol guidelines.

The deliberate shift is reportedly based on new evidence about how heart disease develops over time.

Speaking exclusively to HealthandMe, Dr. Nils P Johnson, Professor of Cardiology, University of Texas, Houston, US, shared that atherosclerosis, or the buildup of plaque in arteries, doesn’t suddenly appear in middle age; it begins silently in youth.

That is why the AHA guidelines highlighted the importance of early screening.

“Cholesterol risk is really about long-term exposure. Just like years of breathing polluted air can damage your lungs, cholesterol builds up in the body over time. It’s not just about how high your levels are at one moment—it’s about how long you’ve lived with them. For example, one person might have very high cholesterol for 30–40 years, while another has moderately elevated levels for 60 years. Over time, their total exposure can be similar—and so can their risk," Dr. Johnson said.

What this means in practice is that treating cholesterol is about reducing total lifetime exposure.

The cardiologist explained that there are two ways to do that: lower cholesterol levels or start treatment earlier.

"Both approaches achieve the same goal—shrinking the overall ‘cholesterol burden’ by reducing how much cholesterol is in the body and how long a person is exposed to it,” the expert said.

The AHA 2026 Cholesterol Guidelines

As per the Global Burden of Disease Study 2021, the burden of heart failure in adolescents and young adults aged 10–24 years is increasing globally.

The guidelines call for early intervention through early screening and healthy lifestyle changes, starting from childhood.

It recommends:

• Children (9-11 years): Cholesterol screening if never done before.
• Adults (30-79 years): Evaluate 10- and 30-year ASCVD risk to determine the need for early intervention
• Considering lipid-lowering therapy for young adults with -- persistent LDL of at least 160 mg/dL, strong family history of ASCVD, and/or at least 10 percent 30-year risk for ASCVD

"They encourage us to think beyond the usual 5- or 10-year risk window and consider the long-term picture—what might happen 20 or 30 years down the road for someone in their 40s or 50s,” Dr. Johnson told HealthandMe.

Also read: ACC/AHA Cholesterol Guidelines 2026 Explained: Start Screening For Cardiovascular Diseases Early

Heart Disease: A Long-term Treatment

The heart expert also stated that chronic conditions like heart disease require long-term management—sometimes for decades—unlike an infection, where a two-week antibiotic course resolves the problem.

“One of the biggest challenges I see in clinics is that patients often come in after a dramatic event—chest pain, a heart attack, or a procedure. Alongside immediate treatment, I prescribe medications and recommend lifestyle changes. And then patients ask, ‘How long do I have to do this? This reflects a very different mindset”.

Dr. Johnson urged cardiologists and other healthcare workers to help patients understand, accept, and sustain these changes over the long term.

“Adjusting to the reality that life will be different for years or even a lifetime is not easy, but it’s essential,” he said.