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Baker's cyst
A Baker's cyst is usually the result of knee-joint conditions, such as arthritis or torn cartilage, that cause the knee to produce too much lubricating fluid.
Symptoms, when they occur, may include a bulge and tight feeling behind the knee.
Treatment, if required, involves treating the underlying condition. Other options include a cortisone injection, fluid drainage with a needle or physiotherapy.
Bad breath

Bad breath is also known as halitosis or fetor oris. Halitosis can cause significant worry, embarrassment, and anxiety but it is relatively easy to remedy.

Bad breath can have causes that aren't due to underlying disease. Examples include poor dental hygiene, dehydration or recently eating certain foods like onions or garlic.

Bursitis

Bursitis (bur-SY-tis) is a painful condition that affects the small, fluid-filled sacs — called bursae (bur-SEE) — that cushion the bones, tendons and muscles near your joints. Bursitis occurs when bursae become inflamed.

The most common locations for bursitis are in the shoulder, elbow and hip. But you can also have bursitis by your knee, heel and the base of your big toe. Bursitis often occurs near joints that perform frequent repetitive motion.

Bulimia

Bulimia (boo-LEE-me-uh) nervosa, commonly called bulimia, is a serious, potentially life-threatening eating disorder. People with bulimia may secretly binge — eating large amounts of food with a loss of control over the eating — and then purge, trying to get rid of the extra calories in an unhealthy way.

Bronchitis
Bronchitis is an inflammation of the lining of your bronchial tubes, which carry air to and from your lungs. People who have bronchitis often cough up thickened mucus, which can be discolored. Bronchitis may be either acute or chronic.