What should you know about light headed and blurred vision after exercise?

Hard exercise increases demand for blood flow and fuel. Stopping abruptly can briefly make you feel faint, while heat and fluid loss can add headache, weakness and blurred vision. Exercising after a long gap without food may bring on low blood sugar, particularly in people using diabetes medicines. Migraine can cause visual disturbance with or without prominent head pain. High blood pressure or type 2 diabetes may affect vision, but a new episode should not be self-diagnosed. The pattern, duration and other symptoms help a clinician decide what to check.

Stop exercising, sit or lie in a cool place, and do not drive until your vision and balance are normal. Sip water and, if you can swallow safely and have not eaten, take a suitable snack. Cool down gradually during future sessions, avoid exercising in intense heat, and record food, fluids, medicines, exertion and symptom timing. If episodes repeat, arrange a medical review before increasing exercise intensity.

Call emergency services for one-sided weakness, facial drooping, trouble speaking, severe confusion, collapse, chest pain, severe breathlessness or sudden persistent vision loss. Seek urgent assessment for a severe new headache, fainting, eye pain, symptoms affecting one eye, or blurred vision that does not clear after rest. Do not exercise again while serious symptoms remain.

Could hydration, food timing, blood pressure, glucose or migraine explain this pattern? Is it safe for me to resume exercise, and should my eyes or heart be checked? What warning signs require emergency care?