A lower back muscle spasm occurs when the muscles in the lumbar region suddenly and involuntarily contract. It usually manifests as sharp pain, stiffness, and limited mobility. While it may begin as a minor muscle strain, it can progress into a chronic condition if poor posture, muscular imbalance, or structural issues in the lumbar spine persist.
💢 Causes of Lower Back Muscle Spasm
1. Overuse of Muscles
- Prolonged sitting, bending, or lifting keeps the muscles under constant tension.
- In particular, the back extensor muscles (erector spinae, multifidus) remain contracted and cannot relax.
Result: Muscle spasm and stiffness develop.
2. Incorrect Exercise or Sudden Movement
- Exercising without warming up, heavy lifting, or straightening up suddenly can cause micro-tears in muscle fibers.
- These tears trigger a protective reflex in the body, leading to spasm.
Especially: Common in exercises with high lumbar load such as deadlifts, squats, or sit-ups.
3. Postural Disorders
- Sitting for long periods in a forward-bent or slouched position (forward head and rounded shoulders posture) disrupts the balance of the back muscles.
- Abdominal muscles become weak while back muscles become overactive.
This muscle imbalance is one of the most common causes of spasm.
4. Lumbar Disc Herniation or Disc Problems
- Increased pressure in the discs irritates the nerves.
- To reduce this irritation, the body “protectively” tightens the surrounding muscles.
If this protective contraction persists, it becomes a sustained spasm.
5. Exposure to Cold or Sudden Temperature Changes
- When muscles get cold, blood flow decreases and elasticity is reduced.
- It is common in people working in cold environments or sitting directly in front of air conditioning.
6. Stress and Emotional Tension
- Stress activates the sympathetic nervous system and increases muscle tone.
- A “protective contraction” may develop especially in the back and neck muscles.
7. Improper Nutrition and Gut-Related Lower Back Spasms
Poor nutrition (sugar, processed foods, low-fiber diet) disrupts the gut microbiota and increases inflammation.
This can cause reflex contractions particularly in muscles adjacent to internal organs, such as the psoas major and quadratus lumborum.
Conditions like gas, constipation, or irritable bowel syndrome (IBS) increase intra-abdominal pressure and place mechanical stress on the back muscles.
This is often referred to as “gut-related lower back pain.”
⚠️ Common Mistakes
1. Continuing to Exercise While in Pain
- Exercising on a spasming muscle increases micro-tears and delays healing.
- The “If I move a bit, it will pass” idea backfires.
2. Remaining Inactive for Too Long
- After a spasm, complete rest may feel good initially but makes the muscles even stiffer.
- Light walking or mobilization exercises speed up recovery.
3. Working All Day with Poor Posture
- Slouching at the computer or sitting with legs crossed increases lumbar load.
- This is one of the most common office mistakes that trigger muscle spasm.
4. Relying Constantly on Painkillers
- Suppressing pain without addressing why the muscle is contracting makes the problem chronic.
- Lasting relief is unlikely without a root-cause solution (e.g., posture correction or manual therapy).
Physiotherapy Approach
- Manual therapy helps release the spasm and improve circulation.
- Stretching and mobilization exercises restore muscle balance.
- Breathing and core-stabilization exercises support the lumbar region.
- Posture training reduces the risk of recurrence.
