Three cases of what could be considered “mild” cluster headache have been described. All three patients were generally able to carry out their work during attacks; all three were men and had unilateral headache with the predominant pain in the ocular region. Relatively few symptoms and signs indicated autonomic system involvement, but at least tearing was invariably present on the symptomatic side. The bouts were generally short-lasting in two of the patients (and partly in the third one), fitting the pattern of “mini-bouts”. Thus, in one of the cases four of the five major criteria (male sex, excruciating severity, cluster phenomenon, autonomic involvement, and unilaterality) were present. In the two other patients the full-blown cluster phenomenon was lacking. Such cases may represent the left-side slope of a “Gaussian severity distribution scale” with regard to cluster headache.
Study of the Small and Middle Enterprises Cluster Phenomenon
