- Facial symptoms (eye/nose watering, flushing) can be related to cluster headache.
- POTS (Postural orthostatic tachycardia syndrome)
- Metabolic disorders (disorders of fatty acid oxidation, organic acids, urea cycle or glycosylation)
- Acute hydronephrosis
- Addison disease
- Brain tumours and other masses in the head
- Familial dysautonomia
- Spinal dysreflexia
- Phaeochromocytoma can cause headache and sweating, but anxiety and palpitations should be prominent, with hypertension (or at least orthostatic hypotension).
- Carcinoid causes flushing
- Occipital lobe epilepsy
- Scombroid toxicity