Does transient ischaemic attack cause weakness on one side?

The weakness may affect the face, arm, leg, or a combination of these areas. It can make an arm feel heavy, cause a leg to give way, or make one side of the face droop. Speech or understanding may also change, and some people develop sudden vision problems, numbness, dizziness, or difficulty walking. TIA symptoms often improve, but their disappearance does not show that the event was harmless or explain the cause by itself.

One-sided weakness has several possible causes, including other problems affecting the brain, nerves, muscles, or blood sugar. A clinician needs to assess the timing, pattern, associated symptoms, and medical history to distinguish them.

Treat sudden one-sided weakness as an emergency. Call emergency services immediately, note when the symptoms started or when the person was last known to be well, and describe any speech, face, vision, balance, or severe headache changes. Do not drive yourself if emergency transport is available. Even if the weakness has completely settled, urgent assessment is needed because a TIA can signal a risk of a later stroke.

Seek emergency help now for new or ongoing weakness on one side, facial drooping, trouble speaking, confusion, sudden loss of vision, severe imbalance, or a sudden severe headache. Do not wait to see whether symptoms improve. If an episode ended before help was obtained, arrange urgent medical review rather than booking a routine appointment.

Ask what may have caused the episode, whether you need brain or blood-vessel tests, which warning signs should prompt another emergency call, and how prescribed treatment can reduce future risk. Tell the clinician about the exact onset and resolution, previous episodes, medicines, and conditions such as high blood pressure, diabetes, or an irregular heartbeat.