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Semen is a thick, cloudy, white fluid that contains sperm. Semen is usually released, or ejaculated, from the penis during a

The seminal vesicles are two sac-shaped structures that produce part of the thick fluid (semen) that contains sperm. The vesicles

Septic bursitis (infectious bursitis) is an infection of the bursae, the small sacs of fluid that cushion and lubricate an area

Seasonal affective disorder (SAD) is a condition in which a person feels depressed at a certain time each year. It most often

A fractured shoulder may involve a broken collarbone (clavicle), shoulder blade (scapula), upper arm (humerus), or the shoulder

Shingles is a painful skin rash caused by the same virus that causes chickenpox. After you've had chickenpox, the virus stays in

Shoe dermatitis is inflammation of the skin on the foot. It is an allergic reaction caused by contact with rubber, leather, dyes

A child who is having severe difficulty breathing: Cannot eat or talk because he or she is breathing so hard. Has flared nostrils

Serum sickness is an unusual reaction to any foreign substance in the body. Venom from insect stings or spider bites and medicines

Severe vaginal bleeding means that you are soaking 1 or 2 pads or tampons in 1 or 2 hours, unless that is normal for you. For most