Conditions
Pontine Stroke
A pontine stroke occurs when blood flow to the pons, a vital part of your brainstem, is interrupted. This interruption can be due to…
Polymyositis
Polymyositis is a rare, long-term (chronic) disease where your body's immune system mistakenly attacks and inflames your muscles. This leads to muscle weakness, especially…
Pneumonitis
Pneumonitis is a general term for inflammation of the lung tissue. Unlike pneumonia, which is usually caused by infection, pneumonitis often results from exposure…
Plica Syndrome
Plica syndrome is a condition where a normal fold of tissue in your knee joint, called a plica, becomes irritated and causes pain. This…
Placenta Accreta
Placenta accreta is a serious pregnancy complication where the placenta grows too deeply into the wall of the uterus. Normally, the placenta detaches easily…
Pityriasis Rosea
Pityriasis rosea is a common, usually mild skin rash that typically appears on the torso, neck, arms, and legs. It often starts with a…
Peutz-Jeghers Syndrome
Peutz-Jeghers syndrome (PJS) is a rare, inherited condition that causes noncancerous growths called polyps to form in the digestive tract. People with PJS also…
Pes Anserine Bursitis
Pes anserine bursitis is a common condition causing pain on the inner side of your knee, a few inches below the joint. It happens…
Peroneal Nerve Injury
Peroneal nerve injury occurs when the common peroneal nerve, a branch of the sciatic nerve located near your knee, is damaged. This damage often…
Peritonitis
Peritonitis is a serious inflammation of the peritoneum, the thin tissue lining the inside of your abdomen and covering your abdominal organs. It usually…
Peritoneal Mesothelioma
Peritoneal mesothelioma is a rare and aggressive cancer that starts in the lining of your abdomen (peritoneum). This lining protects your abdominal organs. The…
Peritoneal Carcinomatosis
Peritoneal carcinomatosis is a condition where cancer has spread to the peritoneum. The peritoneum is a thin membrane that lines your abdominal cavity and…
Patent Foramen Ovale
A patent foramen ovale (PFO) is a small, usually harmless opening between the heart's upper chambers (atria) that didn't close naturally after birth. It's…
Patellar Subluxation
Patellar subluxation is when your kneecap (patella) partially slips out of its normal groove at the front of your knee. This can cause pain,…
Patellar Instability
Patellar instability occurs when your kneecap (patella) moves out of its normal position, either partially (subluxation) or completely (dislocation). This can cause pain, swelling,…
Parsonage-Turner Syndrome
Parsonage-Turner Syndrome is a rare neurological disorder that causes sudden, severe pain in the shoulder and upper arm, followed by weakness and muscle wasting.…
Parotid Gland Tumor
A parotid gland tumor is an abnormal growth of cells in one of your parotid glands, which are the largest salivary glands located in…
Parkinsonism
Parkinsonism is a broad term for a group of conditions that cause symptoms similar to Parkinson's disease, such as slow movement, stiffness, tremor, and…
Paraovarian Cyst
A paraovarian cyst is a fluid-filled sac that forms near the ovary but is not attached to it. These cysts are usually noncancerous (benign)…
Panniculitis
Panniculitis is a group of rare conditions that cause inflammation in the layer of fat just under your skin (subcutaneous fat). This inflammation leads…
Pancytopenia
Pancytopenia is a rare condition where your body has lower-than-normal levels of all three major types of blood cells: red blood cells, white blood…
Paget’s Disease of the Breast
Paget's disease of the breast is a rare form of breast cancer that affects the nipple and the dark skin around it (areola). It…
Paget’s Disease of the Bone
Paget's disease of the bone is a chronic condition where your body's natural process of bone renewal (bone remodeling) becomes abnormal. Instead of orderly…
Otosclerosis
Otosclerosis is a condition where abnormal bone growth occurs in your middle ear, typically around the stirrup-shaped bone (stapes). This new bone prevents the…