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CRACKING JOINTS WHY IT HAPPENS: If your joints are talking back to you, “it's not something to fear in and of itself,” says Joel Press, M.D., physiatrist-in-chief at the Hospital for

Special Surgery in New York City. The sound could stem from air or gas bubbles being released in the synovial fluid around the joint, which is often the case when your wrists, knees or feet

crack. Or, it could be from a muscle or tendon snapping against the side of your anklebone or hip bone when you stretch your leg after sitting for a long time. By contrast, a grinding sound

that occurs in your knees could be due to some degeneration. “As we get older, we all get wear and tear in our joints — it's like gray hair and wrinkles,” Press explains. “As cartilage

wears down, you have less shock absorption so when two areas rub against each other, you may hear some noise.” CAUSE FOR CONCERN: The key question is: Does the joint hurt when it makes

noise? If it does, or if the joint is swollen, red or bruised, has limited mobility, or gets stuck or locked in place, those are signs of a problem. Joint noise accompanied by any of these

symptoms may signal arthritis, an injury or a movement problem in the joint, Press says. If such symptoms are present, see your primary care physician, a musculoskeletal specialist, a

physiatrist or an orthopedic surgeon. SNORING WHY IT HAPPENS: When you sleep, air that flows by the floppy tissues and relaxed muscles at the back of your throat creates a vibrating effect

that can produce snorting or rattling sounds. The aging process and alcohol use can amplify this effect, as they cause tissues to become even more lax, explains Clete Kushida, M.D., division

chief and medical director of the Stanford University Sleep Medicine Center. Plus, since people often gain weight as they get older, they're more likely to become noisy sleepers. “This

may be because if you end up with extra fat tissue around the upper airway in the neck, that can make the airway smaller and more likely to collapse while you sleep,” Kushida explains.

Allergies or changes in nasal function, perhaps due to developing a deviated septum (the septum separates the nasal passages), also can cause you to breathe through your mouth more while you

sleep, which can trigger snoring. CAUSE FOR CONCERN: Occasional snoring isn't anything to worry about. But regular snoring has been linked with elevated blood pressure, and it's a

symptom of obstructive sleep apnea — a potentially serious disorder in which breathing repeatedly stops then restarts during sleep — Kushida explains. Also, if you're always exhausted

despite spending enough time in bed, or if your partner notices that you sometimes stop breathing, gag or make choking sounds when you snore, see a sleep specialist or an otolaryngologist.

If left untreated, sleep apnea can increase your risk of high blood pressure, heart disease and stroke.