Aneurysm is a bulge developed on the artery or blood vessel that supplies oxygenated blood to various organs. Aneurysms develop when because of the blood pressure at the sites of weakened and thin vessel walls. Aneurysms give an appearance of a balloon attached on the artery. Various genetic diseases, medical conditions or trauma may damage the artery walls making them weak and thin.
Aneurysms are of two major types, intracranial (cerebral) aneurysm that develops inside the brain and aortic aneurysms that develop inside the aorta (major blood vessel carrying the oxygenated blood from heart to body parts). Aneurysms may also develop on other arteries however the conditions are rare. Aneurysms often go unnoticed until they grow large enough to press the surrounding nerves and tissues or rupture causing the blood to leak into surrounding areas (subarachnoid haemorrhage). The cerebral aneurysms when press on the tissues and nerves may cause pain near the eyes, numbness, weakness or paralysis on one side of the face. In cases of rupture, you may experience severe headache, double vision, nausea, vomiting, stiff neck, and/or loss of consciousness.