Temperature Sensitivity

Many people with MS experience changes in symptoms when their body temperature rises or falls. Heat sensitivity can cause temporary worsening of symptoms, known as Uhthoff’s phenomenon. Cold sensitivity may lead to stiffness or increased spasticity. These effects are usually temporary but can impact daily life. Learning how to manage temperature changes is important for comfort and safety.

What is temperature sensitivity?

Temperature sensitivity means your MS symptoms change when your body gets too warm or too cold. Heat can make nerve signals less efficient, while cold can increase muscle stiffness.

MS damages the protective covering of nerves (myelin), slowing signal transmission. Heat further reduces nerve efficiency, causing temporary symptom flare-ups. Cold can affect muscle tone and coordination, leading to stiffness or tremor. 

  • Hot weather or exercise may worsen fatigue, vision problems, or balance issues.
  • Cold environments can make movements harder and increase spasticity. 
     
    Tip: Plan activities around cooler times of day and dress appropriately for conditions. 

No. These changes are usually temporary and improve when body temperature returns to normal. 

  • Stay cool: Use fans, cooling vests, or cold drinks during hot weather.
  • Avoid overheating: Take breaks during exercise and keep rooms ventilated.
  • Keep warm: Layer clothing and use heated pads in cold conditions.
  • Hydrotherapy: Swimming in cool water can help manage heat sensitivity.
  • Medical advice: Discuss severe temperature reactions with your MS team. 
  • Carry a cooling scarf or spray bottle in summer.
  • Wear breathable fabrics in hot weather.
  • Use gloves and warm socks in winter.
  • Monitor indoor temperature and adjust heating or cooling as needed. 

If temperature changes cause severe or prolonged symptoms, contact your MS healthcare team. 

  • What is Uhthoff’s phenomenon?
    • It is a temporary worsening of MS symptoms when body temperature rises, often during exercise or hot weather. 
  • Can temperature sensitivity be treated?
    • Whilst there is no cure, cooling or warming strategies and planning can help manage symptoms. 

General Information

Worsening of temperature symptoms can be distressing, but help is available:

Sensory Symptoms