Shower triggers come in four major types:
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Water triggers: some people react to household tap water, because it contains elements and minerals and chemicals.
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Sensation triggers: some people react to the sensation of a shower, especially if the water impact causes body vibrations.
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Postural triggers: some people react to standing up in a shower, especially if the person also has Postural Orthostatic Tachycardia Syndrome (POTS).
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Temperature triggers: some people react to temperature changes, either hot or cold, especially because the water can cause skin symptoms and the air can cause breathing symptoms.
To figure out what's happening:
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Try washing with distilled water. This helps discover tap water triggers.
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Try taking a bath. This helps discover sensation impact/vibration triggers.
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Try taking a shower while sitting. This helps discover postural triggers.
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Try taking a shower with a mild temperature. This helps discover heat/cold triggers.