You can pull nearly any muscle in your back, but strains tend to cluster in a few key areas: the muscles running alongside your spine in the lower back, the broad muscles of the mid and upper back, and the deeper stabilizing muscles that connect your spine to your pelvis and ribs. Lower back strains are by far the most common, and most heal on their own within a few weeks.
Lower Back Muscles
The lower back bears the most mechanical load of any region in your spine, which is why it’s the most frequent site of a pulled muscle. The muscles most often strained here fall into two groups.
The erector spinae are a set of long muscles that run vertically along both sides of your spine from your pelvis up to your skull. They keep you upright, let you bend backward, and control your movement as you lean forward. These muscles are vulnerable during any heavy lifting, sudden twisting, or awkward bending, especially when you’re fatigued or caught off guard. A pulled erector spinae typically produces pain right next to the spine that worsens when you arch your back or stand up from a bent position.
The quadratus lumborum (QL) sits deeper, connecting the bottom rib to the top of the pelvis on each side. Its main jobs are bending you sideways and helping stabilize your lower spine during movement. It also assists with breathing. QL strains often cause pain on one side of the lower back that flares when you twist, bend sideways, or cough. This muscle is a common source of stubborn, hard-to-pinpoint low back pain. Research has found that people with chronic low back pain frequently develop tight, irritable knots (trigger points) in the QL that refer pain to the hip or buttock.
The multifidus muscles are small, deep muscles that span just one or two vertebrae at a time. They fine-tune spinal stability with every movement you make. You rarely “feel” a multifidus strain in the way you’d feel a bigger muscle pull. Instead, weakness or injury here tends to show up as a vague ache and a sense that your back might give out. These muscles often shut down reflexively after a back injury and don’t automatically switch back on, which is one reason first-time back strains so often become recurring ones.
Mid-Back and Upper Back Muscles
The latissimus dorsi is the widest muscle in your body, fanning from your lower spine and pelvis up and around to attach at your upper arm. You use it every time you pull something toward you, do a chin-up, or swing a racket. Strains most commonly happen during the follow-through phase of a throwing motion, when the muscle is being stretched while trying to contract at the same time. Athletes in baseball, swimming, rock climbing, and rowing are especially prone. A pulled lat usually causes pain along the side of your back or under the shoulder blade that gets worse when you reach overhead or pull downward.
The rhomboids sit between your shoulder blades, connecting them to your spine. Their job is to squeeze your shoulder blades together and hold them flat against your rib cage. Strains here often come from repetitive overhead reaching, rowing motions, or poor posture that leaves the muscles chronically overstretched. The telltale sign is a sharp or burning pain between the shoulder blades, sometimes with a visible knot.
The trapezius is a large diamond-shaped muscle covering your upper back and neck. Its upper portion is one of the most commonly strained muscles in the body, usually from sustained poor posture, carrying heavy bags on one shoulder, or sleeping in an awkward position. Upper trap strains feel like a tight, aching band from the base of your skull down to the top of your shoulder.
How Strain Severity Affects Recovery
Not all pulled muscles are equal. Clinicians grade strains on a three-tier scale that directly predicts how long you’ll be dealing with symptoms.
- Grade 1 (mild): Only a small number of muscle fibers are stretched or slightly torn. Pain is localized and manageable, swelling is minimal, and you keep most of your range of motion. These typically heal within a few weeks.
- Grade 2 (moderate): A larger portion of fibers are torn but the muscle isn’t completely severed. Pain is harder to pinpoint, swelling is noticeable, and you lose significant strength and mobility. Expect several weeks to a few months for full recovery.
- Grade 3 (severe): The muscle or its tendon is completely ruptured. This causes immediate, intense pain, rapid swelling, a visible or palpable gap in the muscle, and near-total loss of function. Grade 3 strains often require surgery, with recovery taking four to six months.
The vast majority of back strains fall into grades 1 and 2. Grade 3 ruptures in the back are uncommon outside of high-impact sports or major trauma.
What a Pulled Back Muscle Feels Like
A muscle strain typically produces a sudden, sharp pain during the movement that caused it, followed by a dull ache that sets in over the next several hours. You may notice stiffness that’s worst in the morning or after sitting for a long time, muscle spasms near the injured area, and pain that worsens with specific movements but eases when you rest in a comfortable position.
The important distinction is between a simple muscle pull and something more serious. A pulled muscle produces pain that changes with movement and position. Pain that shoots down your leg, causes numbness or tingling in your feet, or doesn’t change no matter how you move is more likely related to a nerve or disc problem. Loss of bladder or bowel control alongside back pain is a medical emergency that requires immediate attention.
For uncomplicated strains, imaging like X-rays or MRIs isn’t necessary. Clinical guidelines from the American College of Physicians recommend trying conservative management first and reserving imaging for pain that hasn’t improved after six weeks of treatment, or for cases with red-flag symptoms suggesting something beyond a muscle injury.
Why Back Muscles Get Strained
Most back strains share a handful of root causes. Lifting something heavy with a rounded spine forces your back muscles to absorb load they aren’t designed to handle alone. Sudden, uncontrolled twisting, like catching yourself during a slip, can overload muscles before they have time to brace. Prolonged sitting or standing in one position fatigues stabilizing muscles, leaving them vulnerable to strain when you finally do move.
There’s also a less obvious mechanism. When you bend forward fully, the muscles along your spine actually go silent and let your ligaments and discs bear the load. This is called the flexion-relaxation phenomenon. If you then try to lift or jerk upright from that fully bent position, your muscles have to fire from a completely relaxed state against a heavy load, which is a recipe for a strain.
Weak core muscles, tight hamstrings, and deconditioning after long periods of inactivity all raise your risk. People who sit for most of the day and then do intense physical work on weekends are classic candidates.
Reducing Your Risk of Repeat Strains
First-time back strains have a frustrating tendency to come back. The reason is that the stabilizing muscles closest to your spine, especially the multifidus, often weaken after an initial injury and don’t recover their strength or timing without deliberate training.
Low-impact aerobic activity like walking or swimming builds endurance in back muscles without overloading them. Core strengthening, particularly exercises like planks and bird-dogs that challenge stability without excessive spinal flexion, helps protect the lower back during everyday movements. Stretching your back, hips, and hamstrings improves the flexibility that lets your joints share load more evenly.
Simple habit changes matter just as much. Lifting from your legs instead of rounding your back, avoiding prolonged static postures, and changing positions frequently throughout the day all reduce the cumulative strain on back muscles. If your job involves repetitive bending or lifting, building short movement breaks into your routine can be more protective than any single exercise.