Persistent leg pain is remarkably common. CDC data from 2019 found that 36.5% of U.S. adults reported lower limb pain in the previous three months, and that number climbs with age: about half of adults 65 and older deal with it regularly. The causes range from simple muscle fatigue and poor circulation to nerve damage and nutritional deficiencies. Figuring out what’s behind your specific pain starts with paying attention to where it hurts, what it feels like, and when it shows up.
Poor Circulation and Artery Disease
One of the most common vascular causes of ongoing leg pain is peripheral artery disease, or PAD. Narrowed arteries reduce blood flow to your legs, starving muscles of oxygen during activity. The hallmark symptom is cramping in one or both calves, thighs, or hips that starts when you walk or climb stairs and stops when you rest. This pattern is called intermittent claudication, and it’s a reliable signal that your legs aren’t getting enough blood.
As PAD progresses, you may notice coldness in one foot compared to the other, shiny skin on your legs, slow-growing toenails, or sores on your feet that take weeks to heal. In severe cases, the pain can wake you from sleep or hit while you’re lying down doing nothing. Risk factors include smoking, diabetes, high blood pressure, high cholesterol, and being over 65 (or over 50 with other cardiovascular risk factors).
If circulation-related leg pain sounds like yours, structured walking exercise is one of the most effective treatments. Guidelines recommend walking at a pace that brings on moderate-to-strong discomfort for 30 to 45 minutes, at least three times per week, for a minimum of 12 weeks. It sounds counterintuitive to walk into pain, but this approach helps the body develop alternative blood pathways around the blockages.
Vein Problems and Heaviness
While artery disease restricts blood flowing to your legs, chronic venous insufficiency is the opposite problem: blood has trouble flowing back up. Valves inside leg veins weaken and allow blood to pool, which raises pressure in the veins and leads to swelling, skin changes, and sometimes ulcers. The sensation is different from arterial pain. People with venous insufficiency typically describe their legs as achy, tired, or heavy rather than cramping. Burning, tingling, and nighttime leg cramps are also common. Symptoms tend to worsen after long periods of standing or sitting and improve when you elevate your legs.
Nerve Damage and Neuropathy
If your leg pain feels like stabbing, burning, or tingling rather than a deep muscular ache, the source may be your nerves rather than your muscles or blood vessels. Peripheral neuropathy usually starts in the feet as numbness, prickling, or a “pins and needles” sensation and gradually spreads upward into the legs. Some people feel extreme sensitivity to touch, experiencing pain from things that normally wouldn’t hurt, like bedsheets resting on their feet or simply standing.
Diabetes is the most common cause of peripheral neuropathy, but it’s far from the only one. Alcohol misuse, low vitamin B-12 levels, thyroid or kidney disorders, autoimmune conditions like rheumatoid arthritis and lupus, certain infections (Lyme disease, shingles, hepatitis B and C), and exposure to toxins can all damage peripheral nerves. If you’re experiencing these sensations without a known cause, blood work can often identify the underlying problem.
Sciatica and Back-Related Leg Pain
Pain that starts in your lower back or buttock and shoots down the back of one leg is the signature of sciatica. The sciatic nerve begins near the base of your spine, passes through your pelvis and buttock, then runs down the back of each thigh into the lower leg. When a herniated disc, bone spur, or tight muscle compresses this nerve, the result is a burning or electric shock sensation that travels along that path. Coughing, sneezing, or lifting your legs while lying on your back can make it flare. Numbness or tingling often accompanies the pain.
Sciatica almost always affects one side. If both of your legs hurt equally, a different cause is more likely. Most sciatica episodes improve within several weeks with movement, stretching, and over-the-counter pain relief, though persistent or worsening symptoms may need imaging to identify the source of nerve compression.
Nutritional Deficiencies and Electrolytes
Sometimes chronic leg discomfort comes down to what your body is missing. Low magnesium levels cause muscle spasms, cramps, and numbness in the hands and feet. Magnesium deficiency rarely occurs alone; it often shows up alongside low calcium and low potassium, compounding the cramping. People who take certain medications, drink heavily, or have digestive conditions that impair absorption are at higher risk.
Vitamin B-12 deficiency deserves special mention because it can damage nerves directly. B-12 helps maintain the protective coating around nerve fibers, and when levels stay low for too long, the result is peripheral neuropathy: numbness and tingling that starts in the feet and can become permanent if left untreated. This is particularly common in older adults, vegetarians and vegans, and people with conditions that reduce stomach acid or intestinal absorption.
Fibromyalgia and Widespread Pain
If your legs always hurt but the pain isn’t limited to your legs, fibromyalgia may be part of the picture. The current diagnostic criteria require widespread pain affecting at least four of five body regions, and the legs (upper and lower, left and right) count as two of those regions. Fibromyalgia pain tends to be diffuse and hard to localize, accompanied by fatigue, sleep problems, and cognitive difficulties. There’s no blood test that confirms it; diagnosis happens after other conditions have been ruled out.
Blood Clots: The Red Flag to Know
Deep vein thrombosis, a blood clot in a deep leg vein, can cause persistent pain, swelling, warmth, and redness, usually in one leg. On its own, a DVT is treatable. The danger is when a clot breaks free and travels to your lungs, causing a pulmonary embolism. Warning signs of that emergency include sudden shortness of breath, chest pain that worsens with deep breathing or coughing, dizziness or fainting, a rapid pulse, and coughing up blood. Those symptoms require immediate emergency care.
Narrowing Down Your Cause
The type of pain you feel is often the best clue to its source:
- Cramping that comes with activity and fades with rest points toward circulation problems like PAD.
- Heavy, achy legs that worsen with standing suggest venous insufficiency.
- Burning, tingling, or stabbing sensations in the feet spreading upward suggest nerve damage.
- Shooting pain down the back of one leg is classic sciatica.
- Nighttime cramps and spasms may reflect electrolyte or mineral deficiencies.
- Diffuse pain in both legs plus fatigue and poor sleep fits the pattern of fibromyalgia.
Pay attention to timing, too. Pain that worsens with walking but relieves with rest behaves differently from pain that’s worst at night or pain that never really changes. Whether the discomfort affects one leg or both matters. Swelling, skin changes, temperature differences between legs, and any numbness or weakness all help distinguish one cause from another. Keeping a brief log of when your pain occurs, what makes it better or worse, and what it feels like can make a medical evaluation far more productive.