Conversely, syndromes and disorders are defined and diagnosed based on their symptomatology rather than etiology. Fatigue is very common and disabling in MS with a close relationship to depressive symptomatology. Various psychiatric medications were trialed which were unsuccessful in alleviating the symptomatology. PTSD symptomatology, in LGB Veterans, is linked to depression and substance use. The influence of Egyptian culture on psychiatric symptomatology. A survey of exposed U.S. hatters revealed predominantly neurological symptomatology, including intention tremor. OCPD is linked with more severe symptomatology and worse prognosis. The diagnosis of pufferfish poisoning is based on the observed symptomatology and recent dietary history. Yellow fever is most frequently a clinical diagnosis, based on symptomatology and travel history. The parathyroid tumors and pheochromocytomas are removed when they cause clinical symptomatology. These mitochondrial effects are responsible for the symptomatology associated with the disease. Mushroom spore allergies can cause either immediate allergic symptomatology or delayed allergic reactions. Abdominal aortic aneurysms are commonly divided according to their size and symptomatology. This severe symptomatology may require urgent attention. For women, media use predicted disordered-eating symptomatology, drive for thinness, body dissatisfaction, and ineffectiveness.