Does Uhthoff’s phenomenon only involve vision?
A rise in body temperature (whether from exercise, a hot bath, illness, stress, or other causes) may cause other symptoms to appear or re-emerge in patients who have a demyelinating disease. It is not only vision which can be affected. For example, my legs become weak and ataxic when my body becomes overheated. I become extraordinarily fatigued which affects my physical and cognitive abilities.
This is often called “heat intolerance” or “heat sensitivity.”
Some sources strictly associate with Uhthoff’s phenomenon only with visual symptoms, while others expand the description to include additional temporary deficits in body functions caused by damage to the central nervous system.
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MS Signs vs. Symptoms: What is Uhthoff's Phenomenon?