Chronic pain

Some pain lasts a long time. It can stay for months or years.

This pain can feel like a burn. It might also feel like a throb. It can feel like tiny stabs or pins and needles.

This pain can make people feel very sad. It can make it hard to sleep at night. It can even make the heart sick.

Doctors use many ways to help. They may give people medicine. They may use special exercises to help the body.

It is hard to find a cure. Scientists are still looking for new ways to help. They want to make life better for everyone.

Most pain goes away when an injury heals. But some pain lasts a long time. This is called chronic pain. It lasts for more than three months. It can even last for many years.

Chronic pain can feel many ways. It might feel like a burn. It may feel like a throb. Some people feel pins and needles.

This pain can affect the whole body. It can make it hard to sleep. It can lead to heart disease or obesity. It can also affect the brain. Some people feel very sad or anxious. This is called depression.

Doctors use many ways to help. They may give out drugs. Some drugs are for mild pain. Others are for severe pain. Doctors also use physical therapy. This is a way to help through movement. They may also use cognitive behavioral therapy. This helps people manage how they think about pain.

There is no cure yet. Scientists are still studying new ways to help. They are looking at things like nerve blocks. These are ways to stop pain signals.

Many people live with this pain. In some places, up to 55% of people feel it. It affects more people than cancer or heart disease.

Chronic pain is a type of pain that lasts for a long time. It stays or keeps coming back for more than three months. This is different from acute pain. Acute pain usually has a clear cause and goes away when the body heals. Chronic pain can last for many years. It might feel like burning, throbbing, or even electrical shocks. It can be very hard to live with.

Scientists study how this pain works in the body. Sometimes, it happens because of damaged tissue. This is called nociceptive pain. Other times, it comes from damage to the nervous system. This is called neuropathic pain. It can feel like pins and needles or stinging. There is also nociplastic pain. This type happens even when there is no clear damage to the body. The way the brain and nerves send signals can change over time. This is a process called neuroplasticity.

Many different groups help study and classify this pain. The International Association for the Study of Pain is one group. They look at how pain lasts beyond the usual recovery time. Another group uses a system called the ICD-11. In this system, chronic pain is listed under a code called MG30. The DSM-5 is another guide used by doctors. It says a complication is chronic if it lasts more than six months. These groups help doctors understand exactly what a patient is feeling.

This type of pain affects a huge number of people. In some countries, the number of people with pain is between 8% and 55.2%. For example, it is between 30% and 40% in the US. It is between 10% and 20% in Canada and Iran. Chronic pain actually affects more people than cancer, diabetes, or heart disease. In the US, the costs related to this pain are very high. The American Medical Association says it costs about US$560 to $635 billion.

Doctors use many tools to help manage the pain. They might use drug therapy to help. For mild pain, people might take aspirin or ibuprofen. For severe pain, doctors might use morphine or codeine. They also use non-drug treatments. Physical therapy helps the body through movement. Cognitive behavioral therapy helps people manage their thoughts. There is currently no definitive cure for chronic pain. Researchers are still looking for new ways to help, like radiation therapy.

Chronic pain is defined as pain that persists or recurs for longer than three months. It differs significantly from acute pain, which is linked to a specific cause and usually fades as the body heals. Chronic pain can last for many years and often serves no useful purpose for the body. People describe the sensation in many ways, including burning, electrical, throbbing, or even nauseating feelings. It is a complex condition that affects both physical and mental health. Because it can last a lifetime, it requires careful medical management.

To understand how chronic pain works, we must look at the body's signaling systems. When the body experiences pain, it often releases a substance called prostaglandin. This chemical increases the sensitivity of a specific area to stimulation. Under persistent activation, the transmission of signals to the dorsal horn can cause a "pain wind-up" phenomenon. This process lowers the threshold for pain signals to be sent to the brain. It may even cause non-nociceptive nerve fibers to generate pain signals. Researchers believe group C nerve fibers, which are not myelinated, are often involved in this long-term pain.

This continuous stimulation can lead to a process called neuroplasticity. Neuroplasticity refers to the way the nervous system changes its structure and function. In chronic pain, the somatotopic arrangement, or the way the body is mapped in the brain, can change abnormally. This can result in allodynia or hyperalgesia, where even light touch becomes painful. Brain activity also shifts, as seen in EEG studies. These studies show an increase in beta wave activity and a decrease in alpha and theta waves. Additionally, cells like astrocytes and microglia can lose their effective functions or increase activity that worsens the pain.

Medical experts classify chronic pain into several distinct categories. The International Association for the Study of Pain (IASP) uses the terms nociceptive, neuropathic, and nociplastic. Nociceptive pain is caused by inflamed or damaged tissue activating nociceptors, which are special pain sensors. Neuropathic pain results from damage or malfunction in the nervous system, such as the peripheral or central systems. Finally, nociplastic pain arises even when there is no clear evidence of tissue or system damage. Doctors also distinguish between primary pain and secondary pain, which results from another disease.

Different medical systems provide specific classifications for these conditions. The ICD-11 classifies chronic pain under the code MG30. This system includes subcategories like primary musculoskeletal pain or neuropathic pain. The DSM-5 classifies a complication as chronic if it lasts more than six months. This classification does not require a specific physical or mental injury to be present. These systems help doctors identify if the pain is widespread, such as in fibromyalgia, or localized to specific areas like the face.

Chronic pain is a massive global health issue with significant statistics. Epidemiological studies show the prevalence of chronic pain varies from 8% to 55.2% across different countries. For instance, the United States has a prevalence of 30% to 40%. In Canada and Iran, the rates are between 10% and 20%. Remarkably, chronic pain affects more people than cancer, diabetes, or heart disease. In the US alone, the American Medical Association estimates costs related to chronic pain are between US$560 billion and $635 billion.

Managing chronic pain involves a wide range of different treatments. Drug therapy is common and includes both opioid and non-opioid medications. For mild pain, doctors may suggest aspirin or ibuprofen. For severe pain, they might prescribe morphine or codeine. Non-pharmacological approaches, such as physical therapy and cognitive behavioral therapy, are often used as complementary treatments. While there is currently no definitive cure, researchers are investigating new options like nerve blocks and radiation therapy. Effective management can reduce pain by about 30%, which significantly improves a person's quality of life.

Chronic pain is deeply connected to other health systems, including mental and cardiovascular health. It is often linked to mental health consequences like depression and anxiety disorders. There is also a connection to sleep issues, such as insomnia and sleep deprivation. Physical complications can include metabolic disorders, obesity, and even heart attacks. Chronic stress from pain can affect the endocrine system and cardiovascular health. For example, stress may increase how quickly plaque builds up on artery walls, a process known as arteriosclerosis. These connections show why chronic pain is treated as a complex, whole-body issue.