[Blood testosterone levels in patients with Horton's headache].

Serum testosterone level was determined by radioimmunoassay in 57 men, including 23 cases of Horton's neuralgia during the period of recurrent headaches but not during an attack of headache, in 10 cases of trigeminal neuralgia, 10 cases of radicular pain and in 14 blood donors. Only in the blood donors this level was normal, in the remaining cases it was statistically significantly decreased, especially in cases of radicular pains. The author believes that in the period of Horton's headaches the testosterone level is decreased due to recurrent attacks of pain and not due to a process involving the hypothalamus.