Worsens on exposure to heat Tempral aeritis worsen's on exposure to cold: ? - Temporal aeritis does not worsen on exposure to heat. "Infact, the headache worsens on exposure to cold" - Worsening on exposure to heat occurs in Multiple sclerosis (Uh- thoff's symptoms) Multiple sclerosis shows heat sensitivity, it refers to neurological symptoms produced by an elevation of the bodys core temperature. For example, unilateral visual blurring may occur during a hot shower or with physical exercise (Uhthoff'symptoms). It is also common for MS symptoms to worsen transiently sometimes dramatically during .febrile illness. Can lead to sudden 13/1 blindness -Visual symptoms are common in temporal aeritis especially loss of vision and diplopia. - Vision loss can he unilateral or less commonly b/1, transient or permanent and paial or complete. - Loss of vision often reflects an anterior ischemic optic neuropathy caused by occlusive aeritis of posterior ciliary aery, the chief blood supply of the head of the optic nerve. - Less frequently vision loss in GCA occurs due to retinal aery occlusion. - Regardless of the site of the culprit lesion vision loss in GCA is usually profound with more than 80% of patients unable to see hand waving. - "A significant propoion of patient presents with visual loss which can be sudden, severe and NU. - The visual loss is unilateral in 46%, sequential in 37% and B/L in 17%. Common in elderly females -Giant cell aeritis is a disease of the elderly and is common in elderly females. Also see Nov 09.for complete topic.