The diaphragm is the primary muscle used in respiration, which is the process of breathing. This dome-shaped muscle is located just below the lungs and heart. It contracts continually as you breathe in and out.
The diaphragm is a thin skeletal muscle that sits at the base of the chest and separates the abdomen from the chest. It contracts and flattens when you inhale. This creates a vacuum effect that pulls air into the lungs. When you exhale, the diaphragm relaxes and the air is pushed out of lungs.
It also has some nonrespiratory functions as well. The diaphragm increases abdominal pressure to help the body get rid of vomit, urine, and feces. It also places pressure on the esophagus to prevent acid reflux.
The phrenic nerve, which runs from the neck to the diaphragm, controls the movement of the diaphragm.
There are three large openings in the diaphragm that allow certain structures to pass between the chest and the abdomen.
These openings include the:
Explore the interactive 3-D diagram below to learn more about the diaphragm.
A range of health conditions can affect or involve the diaphragm.
A hiatal hernia happens when the upper part of the stomach bulges through the esophageal opening of the diaphragm. Experts aren’t sure why it happens, but it could be caused by:
They’re more common in people who are over the age of 50 or obese.
Small hiatal hernias usually don’t cause any symptoms or require treatment. But a larger hiatal hernia may cause some symptoms, including:
Larger hiatal hernias sometimes require surgical repair, but other cases are usually manageable with over-the-counter antacid medication. Proton pump inhibitors can also help to reduce acid production and heal any damage to the esophagus.
A diaphragmatic hernia happens when at least one abdominal organ bulges into the chest through an opening in the diaphragm. It’s sometimes present at birth. When this happens, it’s called a congenital diaphragmatic hernia (CDH).
Injuries from an accident or surgery can also cause a diaphragmatic hernia. In this case, it’s called an acquired diaphragmatic hernia (ADH).
Symptoms can vary depending on the size of the hernia, the cause, and the organs involved. They may include:
Both an ADH and CDH require immediate surgery to remove the abdominal organs from the chest cavity and repair the diaphragm.
A diaphragmatic cramp or spasm can cause chest pain and shortness of breath that can be mistaken for a heart attack. Some people also experience sweating and anxiety during a diaphragm spasm. Others describe feeling like they can’t take a full breath during a spasm.
During a spasm, the diaphragm doesn’t rise back up after exhalation. This inflates the lungs, causing the diaphragm to tighten. This can also cause a cramping sensation in the chest. Vigorous exercise can cause the diaphragm to spasm, which often results in what people call a side stitch.
Diaphragm spasms usually go away on their own within a few hours or days.
Diaphragmatic flutter is a rare condition that’s often mistaken for a spasm. During an episode, someone might feel the fluttering as a pulsing sensation in the abdominal wall.
It can also cause:
Several things can damage the phrenic nerve, including
This damage can cause dysfunction or paralysis of the diaphragm. But phrenic nerve damage doesn’t always cause symptoms. When it does, possible symptoms include:
A condition affecting the diaphragm can cause symptoms similar to those of a heart attack. Seek emergency treatment if you experience chest pain or pressure that extends to your jaw, neck, arms, or back.
Symptoms of a diaphragm condition may include:
The diaphragm is one of the body’s most important muscles because of its crucial role in breathing.
Protect your diagram by:
Like any muscle, you can also strengthen your diaphragm with special exercises. Diaphragmatic breathing or abdominal breathing is the best way to do this. It involves inhaling deeply and slowly through the nose so that your lungs fill with air as your belly expands. Along with strengthening your diaphragm, diaphragmatic breathing can also reduce stress and lower blood pressure.
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