Collocations for severe - adj.

be, seem, sound
become, grow
remain

extremely, fairly, very, etc.
especially, exceptionally, particularly, unusually
an exceptionally severe frost

increasingly
moderately, relatively
women affected by mild to moderately severe symptoms

Severe is used with these nouns:
acne, allergy, arthritis, asthma, attack, beating, bleeding, blow, bout, bun, burn, case, chill, climate, competition, complication, concussion, condemnation, condition, congestion, consequence, constipation, constraint, cramp, crisis, critic, criticism, cut, cutback, damage, decline, defect, deficiency, deformity, dehydration, dent, depletion, depression, deprivation, diarrhoea, difficulty, disability, disadvantage, disappointment, discomfort, disease, disorder, disruption, distortion, distress, disturbance, doubt, downturn, drop, drought, earthquake, electric shock, embarrassment, episode, erosion, famine, fatigue, flood, form, frost, gale, haemorrhage, handicap, hardship, headache, hepatitis, illness, imbalance, impact, indigestion, infection, inflammation, injury, irritation, jolt, lack, limit, limitation, look, loss, malaria, malnutrition, migraine, nausea, outbreak, pain, paranoia, penalty, persecution, pneumonia, poisoning, poverty, punishment, reaction, recession, reduction, repercussion, repression, reprimand, restriction, sanction, sentence, setback, shock, shortage, sickness, side effect, slump, spasm, stammer, storm, strain, stress, stutter, swelling, symptom, test, tiredness, trauma, tremor, unemployment, weather, winter, wound