Logan Steele
Fever and inflammation are closely linked. Fever is a symptom of inflammation, which is the body's response to an illness, injury, or foreign substance. Inflammation can be acute or chronic, and while it is a normal and important healing process, it can be harmful if it occurs in healthy tissues or persists for too long. Myositis, an autoimmune disease, is characterised by muscle inflammation and can cause fever. This condition can affect the whole body and lead to fatigue, weakness, and pain. Viral and bacterial infections, which cause inflammation, are common causes of fever.
| Characteristics | Values |
|---|---|
| Fever | A fever is how you know your body's inflammatory system is working correctly when you're ill. |
| Myositis | An autoimmune disease that causes your immune system to mistakenly attack your muscles. |
| Symptoms of Myositis | Muscle inflammation, weakness, fatigue, pain, swelling, stiffness, and skin problems. |
| Risk Factors | People in their middle age, women, and those with Sub-Saharan African descent are at higher risk. |
| Treatment | Corticosteroids, fatty fish, fresh fruits, leafy greens, turmeric, ginger, and garlic. |
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What You'll Learn
- Myositis: an autoimmune disease causing muscle inflammation and pain
- Viral and bacterial infections: common fever causes, creating inflammation
- Autoimmune disorders: conditions causing inflammation and fever
- Undiagnosed cancer: cancer-caused inflammation can lead to fever
- Heat exhaustion: excessive heat causes fever and body inflammation
Myositis: an autoimmune disease causing muscle inflammation and pain
Myositis is a rare autoimmune disease characterised by inflammation of muscles, also known as idiopathic inflammatory myopathy. The disease can present in a variety of different forms, and people who have lupus, scleroderma, or vasculitis may also have muscle inflammation as a secondary feature. Myositis can affect the whole body, not just the muscles. The muscle inflammation in myositis is caused by white blood cells of the immune system, which usually protect the body from infections. However, in people with myositis, these cells mistakenly attack a person's own healthy muscle fibres, injuring or destroying them. This affects muscle function and can lead to profound muscle weakness, pain, swelling, and fatigue.
Myositis involves chronic inflammation of the muscles, often occurring with other symptoms, and can affect the muscles used for movement, including the arms, shoulders, legs, hips, abdomen, and spine. The symptoms of myositis include muscle weakness, pain, and swelling, which can make it difficult to do everyday activities such as climbing stairs or reaching overhead. Some patients may also experience other symptoms, such as arthritis in the hands, lung inflammation causing coughing or shortness of breath, skin inflammation or rashes, and muscle degeneration. The most common symptom of myositis is muscle weakness, which often develops slowly and can be subtle at first.
There is no cure for myositis, and it usually persists for the rest of the patient's life. However, treatment can help manage symptoms and put the disease into remission. Typical treatments include corticosteroids, immunosuppressants, and intravenous immunoglobulin, along with stretches and exercises to keep the affected muscles flexible and strong. Exercise and physical therapy are critical for successful treatment, helping to reduce muscle inflammation and fatigue while increasing stamina and muscle mass. An anti-inflammatory diet, such as the Mediterranean diet, may also help to tame flare-ups.
Myositis can be challenging to diagnose, as it mimics or overlaps with other autoimmune diseases, and many physicians are unfamiliar with its symptoms. A typical diagnosis process involves a medical history and physical examination, along with blood tests, muscle and skin biopsies, and other diagnostic tests. It is important to seek medical attention if experiencing new muscle weakness, pain, or other symptoms, especially if they persist or worsen.
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Viral and bacterial infections: common fever causes, creating inflammation
Viral and bacterial infections are among the most common fever causes. Both types of infections are caused by microbes—viruses and bacteria, respectively. They can cause similar symptoms, including fever, inflammation, fatigue, and vomiting. However, they are not the same, mainly due to their structural differences and varying responses to medications.
Viral infections are one of the most common causes of fever. Common viruses such as COVID-19 and the flu activate your immune system and create inflammation, resulting in fever. The flu is frequently accompanied by intense body aches and high fever. Influenza viruses occur during annual winter epidemics and can cause severe illness and even death, especially in children with high-risk medical conditions.
Viral infections of the respiratory system include bronchitis, ear infections, and pneumonia. These viruses can also cause gastroenteritis, commonly known as "stomach flu," and hepatitis, which affects the liver. Neurological viruses affect the brain or spinal cord and can cause paralysis and dangerous brain swelling.
Bacterial infections such as urinary tract infections (UTIs) and tooth abscesses can also lead to fever. Like viral infections, bacterial infections stimulate the immune system, creating inflammation and fever. Bacterial vaginosis, an excess of bacteria in the vagina, is another example of a bacterial infection. Pneumococcal disease, caused by bacteria, can cause sinus and ear infections and some types of pneumonia.
In summary, viral and bacterial infections are common fever causes, often creating inflammation as the body's immune system fights the infection. While these infections can cause similar symptoms, they differ significantly in their structure and response to treatments.
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Autoimmune disorders: conditions causing inflammation and fever
Inflammation is a common symptom of autoimmune disorders, which occur when the immune system attacks the body instead of protecting it. There are over 100 types of autoimmune disorders, and they can affect almost any tissue or organ in the body. Autoimmune disorders can cause inflammation and fever in the body. Some common autoimmune disorders that can cause fever include hyperthyroidism, lupus, rheumatoid arthritis, and rheumatic fever.
Myositis is an example of an autoimmune disorder that can cause muscle inflammation, or inflammatory myopathy. It is characterized by inflammation of the muscles, leading to weakness, pain, and swelling. The immune system mistakenly attacks healthy muscle fibers, causing injury or muscle degeneration. Myositis can affect the whole body and is often associated with other rheumatic diseases such as scleroderma or vasculitis.
Rheumatic fever is an inflammatory autoimmune disease that typically develops after an infection with group A Streptococcus bacteria, such as strep throat or scarlet fever. It commonly affects children aged 5-15 and can cause damage to the heart valves, joints, skin, and brain. Symptoms include fever, abdominal pain, cardiac problems, joint pain, skin rashes, and muscle weakness.
Systemic autoinflammatory diseases (SAIDs) are a group of conditions in which the body's immune system triggers frequent episodes of inflammation and fever. These episodes are often self-limiting and spontaneous. Cryopyrin-associated periodic syndromes (CAPS) are a group of SAIDs that include disorders such as familial cold autoinflammatory syndrome 1 (FCAS1) and Muckle-Wells syndrome (MWS), which are characterized by childhood-onset fevers and rashes.
While muscle inflammation itself may not directly cause a fever, it is important to note that autoimmune disorders, including those that cause muscle inflammation, can lead to fever and other systemic symptoms.
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Undiagnosed cancer: cancer-caused inflammation can lead to fever
While muscle inflammation on its own is unlikely to cause a fever, it can be a symptom of an underlying autoimmune disease, such as myositis, which can cause fever. Myositis is a rare condition that affects several muscles simultaneously, particularly those near the centre of the body, such as the arms, hips, thighs, chest, back, neck, and abdomen. It causes muscle weakness and pain, and in severe cases, muscle tissue can start to break down and die. Myositis is characterised by inflammation of the muscles caused by white blood cells of the immune system, which mistakenly attack healthy muscle fibres.
Undiagnosed cancer can cause fever through infection, inflammation, reactions to medicines or cancer treatments, tumours, or a blood clot in the lungs (pulmonary embolism). In people with cancer, infection is the most common cause of fever. Cancer treatments can lower white blood cell counts, making it harder for the body to fight off infections. This condition is called neutropenia, and it can be life-threatening. Febrile neutropenia is a drop in the number of white blood cells called neutrophils, which can occur with certain cancers and chemotherapy.
In a study by Klastersky et al. in 1973, it was found that infection was responsible for fever in 57% of cancer patients, while the neoplasia (the growth of a tumour) was responsible for 38%. More recently, in a 2007 study by Bleeker-Rovers et al., infection was found to be the cause in 16% of patients, neoplasia in 7%, and non-infectious inflammatory diseases in 22%. These studies show that while infection is often the primary cause of fever in cancer patients, neoplasia and inflammation can also play a significant role.
Fever of unknown origin (FUO) is a challenging clinical problem, especially in cancer patients. While a persistent low-grade fever is not diagnostic of cancer on its own, it may be a rare sign of cancer, especially when accompanied by other symptoms such as extreme fatigue, unexplained weight loss, night sweats, or an abnormal lump or growth. Certain cancers are more likely to cause blood clots, which can also induce fever. These include pancreatic cancer, stomach cancer, lung cancer, and brain cancer.
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Heat exhaustion: excessive heat causes fever and body inflammation
While muscle inflammation itself does not cause fever, it can be a symptom of an underlying condition that does. For example, myositis is an autoimmune disease that causes inflammation of the muscles and can also lead to fever. This is because the immune system mistakenly attacks healthy muscle fibres, injuring or destroying them. Myositis can affect the whole body and cause fatigue, weakness, pain, and stiffness, which can make daily tasks challenging.
Now, turning to the topic of excessive heat and its effects on the body, it is important to note that this can indeed lead to fever and body inflammation. Heat exhaustion, caused by exertion in hot weather, can result in heavy sweating, headache, dizziness, nausea, muscle cramps, and a fast heart rate. The core body temperature may be abnormally high, but it usually stays below 104 degrees Fahrenheit (40 degrees Celsius). If left untreated, heat exhaustion can progress to heatstroke, a life-threatening condition characterised by brain dysfunction, aggressive behaviour, slurred speech, and a dangerously high body temperature.
When the body is exposed to excessive heat, it can experience hyperthermia, an elevated body temperature that is triggered by the hypothalamus in response to infections or heat exposure. This is the body's normal immune response to invaders like viruses and bacteria. While fever is a type of hyperthermia, not all cases of hyperthermia are considered a fever. Fever specifically refers to the body's response to infections, where the hypothalamus raises the internal thermostat to fight off the infection. In contrast, hyperthermia due to heat exposure occurs when the body's cooling mechanisms, such as sweating, are overwhelmed and unable to regulate its temperature effectively.
It is crucial to distinguish between heat exhaustion and heatstroke, as they have different symptoms and require prompt medical attention. If you suspect heat exhaustion, move to a cooler area, remove excess clothing, elevate your legs, and slowly sip water. Call for medical help to ensure proper treatment and prevent progression to heatstroke.
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Frequently asked questions
Muscle inflammation can be caused by myositis, an autoimmune disease where the immune system mistakenly attacks healthy muscle fibres. Myositis can cause fever as a symptom, along with muscle weakness, pain, stiffness, and fatigue.
Myositis can affect the whole body and not just the muscles. Other symptoms include arthritis in the hands, lung inflammation causing coughing or shortness of breath, and skin inflammation or rashes.
Experts are unsure of what exactly causes myositis, but it is believed to be triggered by infection, injury, autoimmune conditions, or drug side effects. Middle-aged people, women, and those with Sub-Saharan African descent are at higher risk of developing the disease.
