Epilepsy is a disorder of the brain. People who have epilepsy have electrical activity in the brain that is not normal, causing seizures. There are different types of seizures. In some cases, a seizure may cause jerking, uncontrolled movements, and loss of consciousness.
1 The following drugs, medications, substances or toxins may possibly cause Rapid breathing as a side effect. 2  Amphetamine intoxication. 3  Procyclidine. 4  Kemadrin. 5  Disipal. 6  Theophylline.  more drug causes...Â».
Pulmonary hypertension can cause shortness of breath, a fast heart rate, or lightheadedness. Mononucleosis. Mononucleosis is a viral infection causing extreme fatigue, sore throat, fever, rash, muscle aches, and more. Atrial flutter. Atrial flutter is an abnormality of the heart's rhythm that causes rapid and sometimes irregular heartbeats.