5. Heat, Cold, or Sunlight
Physical factors can also trigger hives.
Some people develop hives after:
- Hot showers
- Exercise
- Sweating
- Cold weather
- Swimming in cold water
- Direct sunlight
These are known as physical hives, and symptoms usually improve once the trigger is removed.
6. Stress and Anxiety
Emotional stress does not directly cause hives, but it may worsen existing hives or trigger flare-ups in people who are prone to them.
Stress affects the immune system and may increase the release of inflammatory chemicals involved in skin reactions.
Managing stress through exercise, relaxation techniques, adequate sleep, and mindfulness may help reduce episodes in some individuals.
7. Contact With Certain Materials
Some people develop hives after direct skin contact with:
- Latex
- Animal saliva
- Certain plants
- Cosmetics
- Soaps
- Laundry detergents
- Fragrances
If hives consistently appear after using a particular product, switching to a fragrance-free or hypoallergenic alternative may help.
8. Chronic Spontaneous Hives
Sometimes hives continue for more than six weeks without an obvious cause.
