Dizziness after working out

Stopping vigorous exercise suddenly can reduce the muscle action that helps return blood to the heart. You may feel lightheaded, especially after standing still. Sweating in heat can remove fluid and salts, while exercising without enough food can contribute to low blood sugar symptoms such as trembling, weakness or confusion.

Other possibilities include anaemia, heart-rhythm problems such as Atrial Fibrillation, or a balance disorder such as Benign Paroxysmal Positional Vertigo. Dizziness after exercise does not by itself identify one cause. Note whether the room spins or you feel faint, how soon it starts, and whether palpitations, nausea or breathlessness occur.

Stop exercising and sit or lie down in a cool place. Raise your legs if you feel faint, loosen tight clothing and breathe normally. Sip water when you are alert and able to swallow; if you have diabetes, follow your personal plan for suspected low blood sugar. Do not drive, climb or return to the workout until you feel fully steady.

For future sessions, warm up and cool down gradually, avoid the hottest part of the day, and take breaks. Keep a record of food, fluids, medication, intensity and symptoms. A clinician can review recurring episodes and check blood pressure, heart rhythm or blood tests when appropriate.

Call emergency services if dizziness is accompanied by fainting, chest pain, severe breathlessness, a fast or irregular heartbeat, new weakness, trouble speaking, severe headache or confusion. Seek prompt care after an episode that does not settle with rest, or if you were injured in a fall.

Arrange a medical appointment if the symptom returns, happens with light exercise, or is becoming more intense. Heat-related symptoms with hot skin, worsening weakness or confusion require urgent attention; read about Heat Exhaustion and Dehydration for related warning signs.

Ask: Could my medicines, blood pressure, heart rhythm, blood count or blood sugar contribute? Should I change the pace of my warm-up and cool-down? Which symptoms mean I should stop exercising immediately? Bring your symptom diary and mention any heavy periods, recent illness or dietary changes.