Strength training
Learning Center
Is depression a factor in rheumatoid arthritis?
Depression is common in people with rheumatoid arthritis. If it isn't treated, depression may contribute to worsening of rheumatoid arthritis symptoms.
Isometric exercises: Good for strength training?
Learn more about isometric exercises that contract a particular muscle or group of muscles.
Kegel exercises for men: Understand the benefits
Men benefit from Kegel exercises too. Follow these tips to strengthen your pelvic floor muscles.
Keloid scar
Learn about how to prevent, remove or flatten these problematic raised scars that form over scars from acne, tattoos, piercing and other injuries.
Kidney stones
Learn about the symptoms, risks, causes and treatment of this often intensely painful condition.
Klinefelter syndrome
This genetic disorder occurs when a male is born with an extra copy of the X chromosome and may result in low testosterone production and infertility.
Lack of sleep: Can it make you sick?
Lack of sleep can affect your immune system. Here's what you need to know.
Laryngospasm: What causes it?
Laryngospasm is a brief spasm of the vocal cords, which temporarily interrupts breathing.
Loss of sex drive in men: Natural with aging?
Age-related loss of sex drive is normal, but sometimes an underlying condition is at play.
Low sperm count
Having a low sperm count can make conceiving a child difficult, but not necessarily impossible. Learn about possible causes and treatment.
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