Do you sometimes get small, red, itchy spots on your body when you exercise, or when you go out in the sun, or maybe after eating spicy food and sweating? It's normal to feel a little scared when that happens. For some, this can even happen quite often. So today, let's talk about what this is called medically, why it happens, and what can be done about it.
What is this (Cholinergic Urticaria)? Let's understand it very simply!
Simply put, Cholinergic Urticaria is a type of red, raised, itchy welts (hives) that appear on the surface of your skin when your body temperature rises and you start sweating. This is actually a response from your body's immune system. It's like your body is having an allergic reaction to heat. Some people also call it "heat bumps" or "heat hives," which means heat rash or sweat rash.
This condition can occur in anyone, but most often these symptoms first appear in young people between the ages of 10 and 30.
The word "cholinergic" refers to a chemical messenger in our nervous system called acetylcholine (Ach). This is released by our parasympathetic nervous system. "Urticaria" is the medical name for these types of skin rashes.
Does this condition (Cholinergic Urticaria) occur in many people?
Yes, it's not as rare as you might think. Just think, about one in five people will develop hives at some point in their lives. Cholinergic Urticaria is a condition that causes hives that are triggered by a physical cause (such as exposure to heat, cold, or stress). About 7% of people with hives that last longer than six weeks, or chronic hives, have this condition. So if this is happening to you, know that you're not alone.
Why do we get Cholinergic Urticaria?
Experts still don't know exactly what causes this. But there is one main hypothesis. That is, it is caused by the activity of our cholinergic nervous system. Here's how it's thought to happen:
1. When your body temperature rises, you start to sweat. This is normal and helps your body cool down.
2. In response to this, your nervous system releases a chemical called ``acetylcholine'' from nerve endings near the surface of your skin.
3. When this `(acetylcholine)` comes into contact with your skin, it stimulates the skin, causing an allergic reaction, which is what causes those itchy spots (hives) and sometimes swelling.
Simply put, it's like your skin is a little sensitive to a chemical that's released when you sweat.
What are the risk factors for developing Cholinergic Urticaria?
A risk factor is something that increases the chance of developing a condition. If you have chronic hives, you are more likely to develop Cholinergic Urticaria. Also:
- If you have ``Allergic rhinitis (hay fever)`` (an allergy similar to hay fever) .
- If you have `(Asthma)` .
- If you have eczema .
- If someone in your family has a history of Cholinergic Urticaria or chronic hives .
- Hyperhidrosis is a condition where you sweat more than normal .
It's not that everyone who has these things will develop this, but the risk is a little higher.
What are the main triggers for these spots?
Surprisingly, in about nine out of ten people, the main cause of these cholinergic spots is exercise or physical exertion. Apart from that, there are several other reasons:
- Anxiety is an irrational fear or nervousness.
- When you feel angry, sad, or upset.
- When you suddenly go from a cold place to a warm room or into the harsh sunlight outside.
- Because when you have a fever, your body gets hot.
- Hot weather, especially on sunny days like in Sri Lanka.
- Things like hot baths, saunas, and hot tubs.
- When you eat spicy foods, because they make your body hot and sweaty.
- Stress.
- It could also be due to air- and water-tight bandages used to cover a wound to prevent air and water from getting in.
What are the symptoms of Cholinergic Urticaria?
Heat bumps usually start appearing within a few minutes of you sweating. They can last for 20 to 30 minutes. But some people have them for more than an hour. They're most commonly seen on your hands, face, and upper chest.
These spots may appear as tiny red pinpoints on a reddened surface (erythema). Or, these small spots may coalesce to form large, raised welts.
How does your body feel when these spots appear?
A person with Cholinergic Urticaria may experience the following symptoms when these spots appear:
- Itching a lot.
- A burning sensation.
- It feels like tingling.
- Feels warm to the touch.
Are there any other symptoms that may accompany these spots?
This is a bit rare, meaning it doesn't happen to everyone, but some people may experience symptoms like these along with Cholinergic Urticaria:
- Drooling.
- Syncope (fainting).
- Headaches.
- Heart palpitations.
- Difficulty breathing (dyspnea).
- Indigestion or diarrhea.
- Wheezing.
If you experience spots with these symptoms, it is important to definitely see a doctor for advice.
How does a doctor diagnose this condition (Cholinergic Urticaria)?
If a doctor thinks you have heat rash, they will likely refer you to an allergist or dermatologist . They will examine your skin and listen carefully to your symptoms.
They may also do some tests like these:
- Exercise tests: They make you sweat by running on a treadmill, riding a stationary bike, or using other equipment.
- A small amount of a chemical called ``(methacholine)'' is injected to see how sensitive your body is to cholinergic chemicals.
- Warm-up tests: Your body temperature is raised by sitting in a hot tub for a while or by sitting in a heated room.
These tests are the only way to confirm whether you actually have Cholinergic Urticaria or something else.
What can be done to get relief from this condition (Cholinergic Urticaria)?
There's good news! As you get older, the severity of the condition (Cholinergic Urticaria) and the frequency of hives may decrease. It may even go away completely within a few years. Until then, your doctor may suggest treatments like these to help manage your symptoms:
- Antihistamines: These are the most commonly used medications to reduce itching and rashes.
- Some medicines given for asthma.
- Some blood pressure medications.
- Anticholinergics are drugs that reduce sweating.
Your doctor will decide which treatment is best for you.
Can this (Cholinergic Urticaria) cause other complications?
This is very rare, but sometimes Cholinergic Urticaria can be accompanied by a severe allergic reaction called ``anaphylaxis`` caused by exercise . ``Anaphylaxis`` is a life-threatening condition in which the airways swell, making it difficult to breathe.
If this happens to you or someone you know, call 1990 Suwaseriya Ambulance Service immediately or go to a hospital as soon as possible. If you know you are at risk of having a severe allergic reaction, it is also wise to carry an `(epinephrine injector (EpiPen®))` with you. Talk to your doctor about this and seek advice.
How long does this condition (Cholinergic Urticaria) last?
Cholinergic Urticaria usually improves over time, sometimes even completely. About 15% of people with this condition experience a complete recovery from their symptoms. So don't worry.
Can Cholinergic Urticaria be completely prevented?
To be honest, you can't completely stop sweating or getting hot. It's a natural process that helps our bodies cool down and regulate their temperature. Also, it's not a good idea to stop physical activity, that is, exercise, because that's what keeps us healthy.
However, there are a few things you can do to reduce your risk of getting heat rash:
- Reduce spicy foods as much as possible.
- If you exercise, choose times when the temperature outside is lower, such as early in the morning or in the evening.
- Find good ways to manage stress and anxiety. Maybe meditation or yoga will help.
- When bathing, use lukewarm water, not hot water.
- Wear loose, lightweight, sweat-wicking clothing. Fabrics like cotton are best.
When should I see a doctor?
See a doctor if you notice any of these things:
- If the blisters or spots on your body appear infected (e.g., if they are filled with pus and painful to the touch).
- If the spots are accompanied by swelling.
- If you have a rash on your skin for no apparent reason.
- If you scratch too hard to bear.
- If you have difficulty breathing or feel suffocated.
- If you experience symptoms of `(Anaphylaxis)` (if this happens, call 1990 immediately).
What should I ask my doctor?
When you see a doctor, you can ask questions like these:
- What could be the reason why I have this (Cholinergic Urticaria)?
- How can I reduce the risk of getting heat rash?
- What treatment method is best for me?
What is the difference between a 'Heat Rash' and Cholinergic Urticaria?
Heat rash, also known as prickly heat or miliaria, is another skin condition caused by heat. It is actually a type of heat illness. It occurs when the body is unable to cool itself properly through sweating due to extreme heat and humidity. A heat rash can also be a sign of a more serious heat illness, such as heat exhaustion or heatstroke.
Cholinergic Urticaria is a condition that causes discomfort. However, unless it becomes severe, such as anaphylaxis, it is usually not a sign of a more serious heat illness, such as heat rash.
Finally, what you need to remember! (Take-Home Message)
Cholinergic Urticaria doesn't have to stop you from doing your daily activities, exercising, or enjoying hot weather. Your doctor can help you find the cause of your symptoms. If you have Cholinergic Urticaria, there are medications that can help. The hives usually go away on their own in less than an hour. As you get older, these hives may become a thing of the past.
So, stay strong, get the necessary medical advice, and you can live well with this condition!
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