Sit or lie down and rest
Take slow, deep breaths
Drink water
Avoid caffeine, nicotine, and alcohol
Cool down if you are overheated
Loosen tight clothing
Try gentle relaxation or meditation
Avoid sudden physical activity
Check if fever, pain, anxiety, or dehydration may be causing it
Seek medical help if the pulse stays very high, feels irregular, or comes with chest pain, shortness of breath, dizziness, or fainting