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Brain abscess
brain abscess is a pus-filled swelling in the brain. It usually occurs when bacteria or fungi enter the brain tissue after an infection or severe head injury. 
Causes include infections in other parts of the body or an improperly functioning immune system.
Symptoms vary depending on the location of the brain abscess but may include headache and nausea from increased pressure in the brain. In rare cases, neurological symptoms may also be present.
Treatment includes antibiotics and close monitoring. In some cases, the abscess may need to be drained surgically.
Borderline Personality Disorder
A mental disorder characterised by unstable moods, behaviour and relationships.
The cause of borderline personality disorder isn't well understood. Diagnosis is made based on symptoms.
Symptoms include emotional instability, feelings of worthlessness, insecurity, impulsivity and impaired social relationships.
Treatments include talk therapy or, in some cases, medication. Hospitalisation helps if symptoms are severe.
Blisters

blister is a pocket of fluid between the upper layers of skin. The most common causes are friction, freezing, burning, infection, and chemical burns. Blisters are also a symptom of some diseases. The blister bubble is formed from the epidermis, the uppermost layer of skin.

Bladder cancer

Bladder cancer develops when cells in the bladder begin to grow abnormally. Rather than grow and divide in an orderly way, these cells develop mutations that cause them to grow out of control and not die. These abnormal cells form a tumor. Causes of bladder cancer include: Smoking and other tobacco use.

Bipolar disorder

Bipolar disorder causes extreme mood swings that include emotional highs (mania or hypomania) and lows (depression). The exact cause of bipolar disorder isn’t known, but a combination of genetics, environment and altered brain structure and chemistry may play a role.

Manic episodes may include symptoms such as high energy, reduced need for sleep and loss of touch with reality. Depressive episodes may include symptoms such as low energy, low motivation and loss of interest in daily activities. Mood episodes last days to months at a time and may also be associated with suicidal thoughts.
Treatment is usually lifelong and often involves a combination of medications and psychotherapy.