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The protein collagen supports skin, hair, nail, bone, joint, and muscle health. As people age, natural collagen production drops. Some early research suggests collagen supplements offer benefits, but people should ask their doctor about the pros and cons.

Sore muscle pain that doesn't go away after a few days, becomes severe, or affects mobility could be a sign of a muscle strain, sometimes called a pulled muscle. Mild and moderate muscle strain can be treated with RICE (rest, ice, compression, and elevation) and over-the-counter pain medication as needed. Other treatment methods include massage, stretching, and proper hydration. Severe strains should be checked out as they could be signs of an underlying health problem.

A 2025 studyfound that intermuscular fat—fat stored within muscle tissue—may increase a person's risk of heart disease.

An estimated six in 10 women will at some point experience symptoms from pelvic floor weakness. Risk factors include pregnancy (especially with vaginal delivery), chronic constipation, family history, smoking, aging, menopause, obesity, chronic coughing, and occupations involving heavy lifting. Women with pelvic floor weakness may experience signs such as leaking urine, having trouble using a tampon, being unable to fully empty their bladder or rectum, and feeling a bulge in their vagina.