Tachycardia

Tachycardia is an unusually rapid heart rate, which is typically defined as over 100 beats per minute when at rest.

Symptom recognition
Tachycardia is a recognized symptom of myalgic encephalomyelitis in the International Consensus Criteria.

Tachycardia is also a symptom found in some people with Long COVID, and is listed as an optional symptom in the World Health Organization Long COVID diagnostic criteria.

Possible causes
Tachycardia has many different possible causes, including:
 * Dehydration
 * Electrolyte imbalances
 * Recent strenuous exercise
 * High caffeine or alcohol consumption
 * Illicit drug use, e.g. cocaine
 * Postural orthostatic tachychardia syndrome (POTS), which causes tachycardia when someone moves from sitting to standing
 * Psychological / emotional stress, fear or anxiety
 * Various heart problems

Learn more

 * Tachycardia - Mayo Clinic
 * What are the types of tachycardia? - WebMD
 * Tachycardia: Fast Heart Rate - American Heart Association