A cavernous angioma is a tangle of tiny blood vessels that looks like a raspberry on an MRI. It can sit silently for years or leak without warning, so symptoms range from none to sudden emergencies.

The most common problem is seizures. They may start as brief hand jerks, odd smells, or blank stares and can grow into full-body convulsions.

Headaches come next. They feel dull and local, then spike if a small bleed irritates nearby brain tissue. Coughing or bending can make the throb worse.

Weakness or numbness shows up when the lesion presses on motor nerves. One foot may drag, grip strength drops, or part of the face feels “asleep.”

Vision can blur or double if the angioma sits near the eye-movement nerves. Lights may seem too bright, or you may lose the outer edges of sight.

Balance drifts. Walking turns clumsy, like weaving on a boat, and quick head turns can bring on sudden dizziness.

Some people notice memory slips or mood swings that mimic depression, caused by tiny leaks that irritate brain wiring.

A single large bleed causes sudden severe headache, vomiting, and trouble speaking or staying awake—this is an emergency.