
Muscle soreness can be caused by a variety of factors, including exercise, injury, or disease. When muscles are sore, they often retain water, which can lead to temporary weight gain. This water retention is a normal part of the body's healing process and is caused by inflammation in the muscles. The tearing of muscle fibres during exercise or injury can induce water retention as the body tries to repair the damage. Additionally, the body stores glycogen in water, so sore muscles may retain water to provide energy for the healing process. While this weight gain may be discouraging for those trying to lose weight, it is important to remember that it is often temporary and that muscle weighs more than fat.
| Characteristics | Values |
|---|---|
| Is muscle soreness linked to water retention? | Yes |
| Why does water retention occur? | The tearing of muscle tissue and the rupture of muscle cells initiates an inflammatory response. As a part of this response, the hormones ADH and aldosterone cause the kidneys to retain water. |
| Is water retention after working out normal? | Yes, it is a normal part of muscle recovery. |
| How long does water retention last? | Water retention is temporary and usually lasts a couple of weeks. |
| What are other causes of water retention? | Salt intake, mental stress, intense training, calorie deficit, hormonal changes, alcohol consumption, etc. |
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What You'll Learn

Muscle soreness and water retention
Water retention after a workout is a sign that your body is recovering properly from your training session. The tearing of muscle tissue and the rupture of muscle cells initiates an inflammatory response, which is a normal part of muscle recovery. As part of this response, the hormones ADH and aldosterone cause the kidneys to retain water. After a few days, balance is restored and water weight is eliminated.
Delayed-onset muscle soreness (DOMS) is a common phenomenon marked by muscle pain ranging from mild to debilitating and manifesting 24 to 48 hours after your workout. DOMS is common in individuals who are new to resistance training or as a response to a change in exercise routines, such as adding challenging new exercises or increasing weight loads. Besides muscle soreness, other symptoms of DOMS include loss of strength, decreased range of motion, decreased neuromuscular function, mild inflammation, and an increase of 2 to 3 pounds or more in body weight.
Water retention is a common cause of temporary weight gain after working out. This is because muscle weighs more than fat, and the body's healing response to muscle soreness includes water retention around the inflammation and micro-tears. This retention can cause temporary weight gain while your muscles heal.
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Inflammation and water retention
Water retention, also known as oedema or edema, occurs when excess fluids build up in the body. This can cause swelling in the feet, ankles, hands, and legs, a condition known as peripheral edema.
Inflammation is a primary cause of water retention. When muscles are sore, they are inflamed, and this inflammation can lead to water retention. Exercise-induced muscle soreness, known as Delayed Onset Muscle Soreness (DOMS), often results in mild inflammation and a temporary increase in body weight due to water retention. The tearing of muscle tissue and the rupture of muscle cells during exercise trigger an inflammatory response, which peaks 24 to 36 hours post-workout. As part of this response, the hormones ADH and aldosterone cause the kidneys to retain water. However, after a few days, the body restores balance, and the retained water weight is eliminated.
Water retention due to muscle soreness and inflammation is a normal and healthy part of the muscle recovery process. Staying well-hydrated can aid in muscle recovery, and a balanced diet rich in whole, unprocessed foods can provide the necessary nutrients to reduce excess inflammation. Additionally, a pre-exercise warm-up can help minimize muscle tissue damage, thereby reducing inflammation and subsequent water retention.
While mild fluid retention is typically not a cause for concern, it can sometimes indicate a more serious underlying health condition, particularly when it affects specific parts of the body, a condition known as localized oedema. In such cases, it is advisable to consult a doctor, as oedema can be symptomatic of heart, kidney, or liver disease. Self-care options for mild fluid retention include a low-salt diet, drinking plenty of water, and taking supplements like calcium, magnesium, and vitamin B6, which help regulate fluid balance.
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Cortisol and water retention
Cortisol is a hormone that is released in response to stress. It is responsible for suppressing immune function and mobilizing energy. While cortisol is essential for helping the body respond to stressful situations, chronically high levels of cortisol can have negative effects on the body.
Excess cortisol can increase water weight. Cortisol levels directly correlate with antidiuretic hormone (ADH) levels, which communicates with the kidneys to control the amount of water in the body. Electrolytes like magnesium and potassium also play a role in managing water retention, and electrolyte imbalances can lead to increased water weight.
Psychological stress has been shown to induce sodium and fluid retention in men at high risk for hypertension. The degree of retention was found to be related to the increase in heart rate during stress, indicating that stress can impact renal excretory functions and play a role in long-term blood pressure regulation.
In addition to water retention, high cortisol levels can cause a range of other symptoms, including high blood pressure, poor wound healing, irritability, muscle weakness, decreased cognition, and decreased libido. Conditions such as Cushing's disease and Cushing's syndrome are characterized by excessively high cortisol levels, which can result in massive water retention all over the body.
To manage water retention caused by elevated cortisol levels, it is important to address the underlying stress that may be contributing to increased cortisol. Additionally, staying well-hydrated, maintaining a balanced diet, and getting enough sleep can help regulate fluid balance and support overall health.
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Glycogen and water retention
Water retention is a normal part of muscle recovery after a workout. Delayed onset muscle soreness (DOMS) is a common phenomenon marked by muscle pain and mild inflammation, which can cause water retention.
Glycogen is a stored form of glucose, which the body holds in the liver and muscle cells as a quick source of fuel. Each glycogen molecule is made up of a protein core, surrounded by glucose subunits. Each gram of glycogen stored in the body is bound to 3 or 4 grams of water. This means that the more glycogen the muscles have, the more water they will retain.
Glycogen is the main culprit behind sudden weight loss and weight gain, especially during a diet. When starting a new workout routine, the body quickly stores more glycogen and water to help it adapt to its new active lifestyle. After a month or so, the body's glycogen and water levels will likely stabilise.
Exercising, staying hydrated, and reducing salt intake can reduce water retention.
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Salt and water retention
Water retention after exercise is a normal part of muscle recovery. Muscle soreness, or DOMS (delayed-onset muscle soreness), is a common phenomenon marked by muscle pain ranging from mild to debilitating, usually manifesting 24 to 48 hours after a workout. This soreness is caused by the tearing of muscle tissue and the rupture of muscle cells, which initiates an inflammatory response. Inflammation is a main cause of water retention, and as such, sore muscles can retain water.
Vasopressin, a neuroendocrine hormone, is released in response to small increases in plasma osmolality. This release occurs even before thirst is triggered, and the system may be an important contributor to the endogenous rhythmical free water accrual and its modulation by dietary salt.
The aldosterone-driven changes in body fluid balance occur across all levels of salt intake. The increase in aldosterone reduces urine volume and increases fluid intake, resulting in increased water balance and body weight.
High-sodium meals make your body retain water, which is not good for your heart as it increases blood pressure, putting a strain on your heart and kidneys.
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Frequently asked questions
Yes, muscle soreness can cause water retention. This is due to inflammation and micro-tears in the muscle fibres, which is the body's natural healing response.
Water retention is usually temporary and should go away within a day or two. However, it can last a couple of weeks for the bloating to disappear.
DOMS, or delayed-onset muscle soreness, is characterised by muscle pain ranging from mild to debilitating, loss of strength, decreased range of motion, decreased neuromuscular function, mild inflammation, and an increase of 2 to 3 pounds or more in body weight.
Staying well-hydrated and maintaining a balanced diet can help reduce excess inflammation and water retention. It is also recommended to track your fitness progress with body measurements instead of relying solely on the numbers on a scale.











































