Tachycardia (if your heart beats faster than usual, more than 100 beats per minute) can be a normal response to exercise or stress or a sign of disease
Wolff-Parkinson-White syndrome (WPW) can cause episodes of fast heartbeat, or tachycardia. Learn more here about the symptoms and treatments for WPW.
Implantable cardioverter defibrillators
An ICD, sometimes called an ACID (automated implantable cardioverter defibrillator), may be needed if you have an abnormally fast or irregular heartbeat.
Calcium channel blockers (CCB)
Find out what the most common types of calcium channel blockers are used for, how they work and any side effects associated with taking them.
Rabies in humans is caused by a bite or scratch from an infected animal. Learn what to do if you are bitten by an animal that may have rabies.
Ketamine is a drug used by doctors and vets. It can also be used illegally to get high. Learn more about ketamine and the dangers of long-term abuse.
Jellyfish stings are common and mostly just painful. If serious, you may need emergency medical attention. Read this page on jellyfish sting treatment.
Opioids are a group of medicines prescribed by doctors to treat pain. Learn about side effects, withdrawal symptoms and what to do in an overdose.