Introduction Kidney stones are solid masses or crystals that form from substances (like minerals, acids and salts) in your kidneys. They can be as small as a grain of sand…

Introduction Psoriasis is an autoimmune skin condition that causes a rash with itchy, scaly patches, most commonly on the knees, elbows, trunk and scalp. Psoriasis is a common, long-term (chronic)…

Introduction Osteoporosis is a disease that weakens your bones. It makes your bones thinner and less dense than they should be. People with osteoporosis are much more likely to experience…

Introduction Osteoarthritis is the most common type of arthritis (a condition that affects your joints). Healthcare providers sometimes refer to it as degenerative joint disease or OA. It happens when…

Introduction Obesity is a complex disease involving having too much body fat. Obesity isn't just a cosmetic concern. It's a medical problem that increases the risk of many other diseases…

Introduction The liver is an organ that sits just under the rib cage on the right side of the abdomen. It can weigh up to 4 pounds (1.8 kilograms). The…

Introduction A lipoma is a round or oval-shaped lump of tissue that grows just beneath the skin. It’s made of fat, moves easily when you touch it and doesn’t usually…

Introduction Infertility is a condition of your reproductive system that causes women to be unable to get pregnant (conceive). Infertility can affect anyone and has many causes. Getting pregnant involves…

Introduction Irritable bowel syndrome (IBS) is a group of symptoms that affect your digestive system. It’s a common but uncomfortable gastrointestinal disease or condition that affects your intestines. People with…

Introduction High blood pressure is a common condition that affects the body's arteries. It's also called hypertension. If you have high blood pressure, the force of the blood pushing against…