{'fraction_non_alphanumeric': 0.019490254872563718, 'fraction_numerical': 0.0, 'mean_word_length': 5.958333333333333, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Primary Headache Disorders: Trigeminal Autonomic Cephalalgias, Headaches With Specific Triggers, and Other Primary Headache Disorders

Primary headache disorders are those in which the predominant clinical feature is headache that is not caused by or attributed to another disorder. This chapter reviews the common primary headache disorders of migraine, tension-type headache, and chronic daily headache. The present chapter reviews less common primary headache disorders, such as trigeminal autonomic cephalalgias and headaches with certain triggers. A careful history, physical examination, and additional testing are often necessary to rule out a secondary cause.