Heat makes multiple sclerosis (MS) symptoms worse because the protective myelin sheath around nerves is damaged in MS, making nerves highly sensitive to temperature changes; increased body heat slows or blocks nerve signals, temporarily worsening symptoms like fatigue, weakness, and vision problems, a phenomenon known as Uhthoff's phenomenon, until the body cools down. Even a small rise (0.2-0.5°C) in core body temperature can disrupt nerve function, making it harder for damaged nerves to transmit electrical impulses effectively.
If you live with multiple sclerosis, you may notice that your symptoms feel worse when the weather is very hot or humid, or when you have a fever. A higher body temperature makes it harder for nerves damaged by MS to conduct electrical impulses. This can make it more difficult for you to function.
However, triggers that may provoke or worsen a multiple sclerosis attack include: Heat. Poor sleep. Stress.
The Uhthoff phenomenon (also known as the Uhthoff sign or Uhthoff syndrome) is a transient worsening of neurological symptoms related to a demyelinating disorder such as multiple sclerosis when the body becomes overheated, as in hot weather, exercise, fever, saunas, or hot tubs.
There's also an association between sunlight exposure and the risk of MS . Sunlight is the body's most efficient source of vitamin D. The farther away from the equator a person lives, the higher the risk of MS . This suggests that exposure to sunlight may offer protection from MS .
Foods to avoid with MS
You should limit foods and drinks that cause inflammation, such as: Red meat, processed meats, high-fat dairy products, and other foods high in saturated fat or cholesterol. Sugary drinks and foods. Ultra-processed foods, such as cookies, chips, and fast food.
Supplements that boost your immune response — for instance, selenium, copper, and manganese — may worsen autoimmune attacks in MS. Large doses of vitamin E and vitamin C can thin your blood, which may lead to MS complications. Single supplements can contain high doses, making them potentially more dangerous.
MS most commonly affects remembering recent events and remembering to do things. Some people with MS also say that it may take more time and effort to actively search for a memory. This is known as recall. Fortunately there are lots of ways that you can compensate for these kinds of problems.
Personal Independence Payment (PIP)
You can spend it on whatever you need, such as paying for support to remain independent during relapses, or to help with extra costs such as heating, transport or help around the house. Some people with MS assume they can't get PIP because they're 'not disabled enough'.
MS-related heat sensitivity doesn't cause new symptoms but exacerbates or aggravates existing ones. Some common symptoms that people experience an increase in are fatigue, blurred vision, loss of balance, muscle weakness or cognitive issues.
Lifestyle and home remedies
For many people, getting treatment abroad can mean better access to specialists, faster service, or more affordable options. Countries like Turkey, Azerbaijan, Spain, and Poland have become popular destinations for MS patients who are looking for both quality and affordability.
Conditions that can cause heat intolerance.
You may develop this symptom if you have an anxiety disorder, if you're in menopause, or if you have thyrotoxicosis (when your thyroid gland makes too much thyroid hormone) from any condition, like hyperthyroidism.
5 Tips for Living Better with MS: Patients and Caregivers
Hot showers can temporarily worsen MS symptoms due to elevated core temperature. It's often recommended to use cooler or lukewarm water to avoid heat intolerance.
In MS, the immune system attacks and destroys the fatty substance that coats and protects nerve fibers in the brain and spinal cord.
Symptoms of advanced MS
Overall, MS patients had significantly higher scores on intensity (State anger) anger and trait anger than did controls, as well as a trend to direct anger toward other persons or objects in the environment (higher Anger Expression-out score) and to hold in or suppress angry feelings (higher Anger Expression-in score).
Vitamin B12 is vital for fixing and keeping the myelin sheath healthy. It supports the nervous system and helps recover from conditions that damage the myelin sheath.
They include drug treatments, exercise, diet and other lifestyle changes. It's best to get advice on your multiple sclerosis treatment with a specialist, like a neurologist. An MS nurse can discuss treatment for MS generally, but only an MS specialist can advise you and prescribe many of the treatments.
Higher ambient UV-B levels were associated with a 36% to 45% reduced risk of MS across all age groups combined (table 3). For specific age group exposure, increased ambient UV-B levels at ages 5 to 15 and 31 to 40 years were associated with statistically significant 51% and 65% reduced risks of MS, respectively.
Essential Nutrients for Myelin Growth
As well as disability benefits, there's other financial help out there that might make living with MS easier. Find out more about free public transport, disabled facilities grants, help with keeping warm in winter, prescription charges and dealing with debt.
The exact trigger for Multiple Sclerosis (MS) is unknown, but it's believed to be a combination of genetic predisposition and environmental factors, including certain infections (like Epstein-Barr Virus), low Vitamin D levels (linked to less sunlight), smoking, obesity, stress, and potentially genetic susceptibility. These factors can trigger an autoimmune attack where the immune system mistakenly damages myelin in the central nervous system.