Left-Sided Weakness When It Is Not a Stroke

Weakness can result from a nerve or spine problem, migraine, low blood sugar, medication effects, or reduced movement after an injury. Numbness and tingling may occur alongside nerve irritation. However, a transient episode can still be a warning sign, and symptoms that improve do not prove that a stroke was not involved. Conditions such as hypertension, atrial fibrillation and type 2 diabetes can raise stroke risk, so a clinician may review these as well as strength, speech, coordination and sensation.

If weakness began suddenly, note when the person was last known well and call emergency services. Do not drive yourself. If symptoms are mild, gradual or recurring, arrange a prompt GP consultation for a neurological examination and medication review. Do not change blood pressure medicine without advice. Write down triggers, duration, affected areas, speech changes, vision changes and associated headache; this helps the assessment.

Get emergency help for new one-sided weakness with facial drooping, speech trouble, confusion, loss of balance, severe headache, vision change or difficulty walking. Treat a brief episode as urgent too. While waiting, keep the person safe, avoid food or drink if swallowing is affected, and do not give medicines unless emergency professionals advise it.

Could this be a nerve, migraine or circulation problem? Do I need brain or blood-vessel tests? How should I monitor blood pressure and reduce future risk?