Inappropriate sinus tachycardia (IST) is a health problem in which the heart beats very quickly without a good reason. Read on to learn more about causes, symptoms, diagnosis, and treatment.

Ptosis is when the upper eyelid droops down more than it should. If the ptosis is severe, it may block vision.

A pterygium is a type of noncancer growth on your eye. It is often only a minor problem unless it causes vision problems.

Premature ventricular contractions, or PVCs, are a type of abnormal heartbeat. Read on to learn more about their cause, symptoms, diagnosis, and treatment.

Restrictive cardiomyopathy, or RCM, is when the chambers of the heart become stiffer over time. Read on to learn details about this condition.

Post-polio syndrome (PPS) is a disorder of the nerves and muscles that happens in some people many years after they have had polio. PPS may cause new muscle weakness that gets worse over time, pain in the muscles and joints, and tiredness.

Polymyalgia rheumatica (PMR) is an inflammatory condition that can cause aching and stiffness. It tends to affect the neck, shoulders, and hips. The aching and stiffness are usually worse in the morning.

A pilon fracture is a type of break of the shinbone (tibia) that happens near the ankle. Most of the time, it involves breaks in both the tibia and fibula of the lower leg. The lower ends of these bones make up part of the ankle.

Pericardial effusion is the buildup of extra fluid in the space around the heart. If too much fluid builds up, it can put pressure on the heart. This can prevent it from pumping normally.

In parotid duct obstruction, part of your parotid duct becomes blocked. As a result, saliva can't flow normally from your parotid gland into your mouth.