What causes muscle pain?

Muscle pain is something most of us deal with at some point. It might be a dull ache after a busy day, a sharp twinge when you move or a general soreness that makes you feel stiff and tired. Sometimes the cause is obvious, like exercise or a knock. Other times it can be harder to pin down.

In most cases, muscle pain is not serious and improves on its own with time and simple care. But understanding why your muscles hurt can help you manage the discomfort better and know when to seek advice.

In this guide we explain the most common causes of muscle pain, what they feel like, and how products, such as those in the Ralgex range, may help as part of short-term relief.

What causes muscle aches and pains?

Injury

Muscle injuries happen when fibres are stretched or torn. This can occur suddenly, such as during a fall, twist or awkward lift, or during sport. Pain may be felt straight away or develop over several hours. Injured muscles are often sore to touch and may feel weaker than usual. Swelling or bruising can also appear.

Mild strains often settle with rest and gentle movement, but pain can feel uncomfortable, especially in the first few days. For small, local areas of soreness, topical warming rubs or patches such as Ralgex® Double Action Heat Patch can be used for temporary relief. Ralgex products work by increasing the feeling of warmth in the skin, which can help soothe aching muscles while they recover. They should only be applied to unbroken skin and used exactly as directed on the label.

If pain is severe, getting worse, or stopping you from moving normally, medical advice is important to rule out a more serious injury.

Overuse

Overuse muscle pain is extremely common. It happens when muscles are worked harder or for longer than they are used to. This could be from starting a new exercise routine, doing physical work after a long break or repeating the same movement again and again, such as typing or lifting.

A well-known type of overuse pain is delayed onset muscle soreness (DOMS). This usually appears one to three days after activity and can make muscles feel tender, stiff or weak. Although uncomfortable, it is usually short-lived.

Building activity levels gradually is the best way to reduce overuse pain. While muscles are sore, gentle movement and warmth can help ease stiffness. Some people choose to use warming, CBD-infused, products.

For example, Ralgex® Advanced CBD Muscle & Joint Cream can be applied to help you feel more comfortable while the muscles settle, without the greasy feel of some other products. The CBD formula also provides added benefits by working alongside other natural extracts to ease pain and reduce inflammation.

Tension

Muscle tension often builds up slowly. Stress, anxiety and long periods of sitting can cause muscles to tighten without you realising. The neck, shoulders, upper back and jaw are common problem areas.

Tension-related pain is often described as tight, heavy or aching rather than sharp. Poor posture, such as leaning forward over a laptop or phone, can make this worse.

Regular movement, stretching and paying attention to posture can help reduce tension over time. Heat is commonly used for tight muscles, and warming heat applicators like Ralgex® Heat Spray may provide short-term comfort for localised areas, particularly around the neck or shoulders, when used safely.

Infections

Muscle aches are a common symptom of infections, especially viral illnesses such as colds and flu. In these cases, pain is usually widespread and comes with other symptoms such as fever, tiredness, headache or chills.

This type of muscle pain is caused by your immune system responding to infection, rather than a problem in the muscles themselves. Rest, fluids and time are key while the body fights the infection. Urgent medical advice is needed if muscle pain comes with severe symptoms such as a stiff neck, chest pain, breathing difficulties or confusion.

Electrolyte imbalances and dehydration

Muscles rely on fluid and electrolytes (salts such as sodium and potassium) to work properly. When levels drop, muscles may ache or cramp. This can happen if you sweat heavily, do prolonged exercise without drinking enough or are unwell with vomiting or diarrhoea.

Cramps linked to dehydration often come on suddenly and can be painful, particularly in the calves or feet. Keeping well hydrated and replacing lost fluids is important, especially during hot weather or physical activity.

If cramps or muscle aches happen frequently, or without a clear reason, it may be worth discussing this with a pharmacist or GP to check for underlying causes.

Poor sleep

Sleep is essential for muscle repair and recovery. When sleep is poor or disrupted, muscles may feel sore, heavy or more sensitive to pain the next day. Tiredness also lowers your pain threshold, making aches feel worse than usual.

Long-term poor sleep can contribute to ongoing muscle discomfort and stiffness. Improving sleep habits can make a real difference. If minor muscle pain is affecting your rest, gentle stretching, warmth or a topical rub on small areas may help you relax before bed.

Medications

Some medicines list muscle pain, cramps or weakness as possible side effects. These can include certain cholesterol-lowering medicines, diuretics (water tablets), and some treatments for asthma or infections.

If muscle pain starts after beginning a new medicine, it is important not to stop treatment suddenly. A pharmacist or GP can help you decide whether the pain could be linked to your medication and what to do next. Seek medical advice urgently if muscle pain is severe or comes with symptoms such as dark urine, fever or extreme weakness.

Underlying conditions

In some cases, muscle pain is linked to an underlying health condition. This may include long-term pain conditions where muscle pain is widespread, musculoskeletal problems affecting joints and surrounding tissues, nerve-related pain that feels like muscle ache, or issues related to circulation, hormones or vitamin levels.

Pain that lasts longer than a couple of weeks, keeps returning or interferes with daily life should always be checked. Red flags include unexplained weight loss, persistent night pain, numbness, weakness or swelling.

Where Ralgex fits in

Ralgex products are designed for the temporary relief of minor, local muscle aches and pains, such as those caused by mild injury, overuse or muscle tension. They are applied directly to the skin and can help soothe discomfort while you address the underlying cause, such as rest, hydration, posture or activity levels.

Always follow the product instructions carefully, avoid using on broken or irritated skin and do not combine with other heat sources. If muscle pain lasts longer than two weeks, keeps coming back, is getting worse or is affecting your everyday activities, it’s important to visit a GP for further advice rather than relying on topical relief alone.