Headache as a difficult case. Is it always possible to make a diagnosis?

The authors give their own clinical observation of a patient with a headache. Headache is one of the most common complaints and a diagnostic search requires a multidisciplinary approach. It is important for any specialist to answer the question with what headache he is dealing with. Is this a primary headache as a leading symptom of damage to the nervous system, or is it a secondary headache that has arisen against the background of somatic disease, as one of the manifestations of the symptoms of the disease? The next question is the choice of a diagnostic algorithm to determine the cause of the headache, and each specialist has his own one. The pediatrician primarily eliminates the secondary headache associated with an acute process or exacerbation of a chronic disease, and studies inflammatory markers. The neurologist is rather aimed at eliminating the primary headache, and the research algorithm is designed to search for an organic disease from the nervous system. In the presented clinical observation, a wide range of high-tech studies was carried out, which did not allow to determine the final diagnosis in this case.