Modifiers matching headache:

• primary,
• secondary,
• common,
• persistent,
• intense,
• throbbing,
• psychosomatic,
• episodic,
• vascular,
• severe,
• debilitating,
• simple,
• major,
• recurrent,
• paroxysmal,
• chronic,
• underlying,
• serious,

Simple categories matching severe:

• activity,
• disease,
• blemish,
• weather,
• occurrence,
• area,
• damage,
• patient,
• condition,
• infection,
• ache,
• sequela,
• illness,
• dysfunction,
• abuse,
• complication,
• behavior,
• state,
• event,
• arrhythmia,
• sanction,
• lesion,
• mutation,
• attack,
• storm,
• inflammation,
• asthma,
• vibration,
• conduct,
• incident,
• upset,
• harm,
• symptom,
• hypocalcemia,
• malaria,
• punishment,
• syndrome,
• constraint,
• defect,
• infraction,
• infirmity,
• action,
• group,
• reaction,
• infringement,
• entity,
• dermatosis,
• change,
• violation,
• hazard,
• impact,
• morbidity,
• stage,
• hardship,
• accident,
• situation,
• sign,
• stress,
• work,
• offense,
• malnutrition,
• hypoxia,
• difficulty,
• disability,
• headache,
• circumstances,
• misconduct,
• measure,
• impairment,
• problem,
• misrepresentation,
• manifestation,
• pathology,
• behaviour,
• offence,
• bias,
• perturbation,
• circumstance,
• injury,
• arthritis,
• psychosis,
• warning,
• interaction,
• intoxication,
• form,
• case,
• diarrhea,
• hypercapnia,
• crime,
• process,
• consequence,
• emotion,
• disaster,
• conflict,
• fire,
• harassment,
• elements,
• cytopenia,
• disturbance,
• tb,
• penalty,
• trauma,
• depression,
• sensation,
• anomaly,
• anxiety,
• ailment,
• abnormality,
• wound,
• windstorm,
• atmosphere,
• pain,
• handicap,
• challenge,
• deformation,
• disorder,
• acne,
• discomfort,
• phenomenon,
• duty,
• toxicity,
• experience,