5 Reasons You Have Swollen Legs After Working Out

You exercise to slim down and shape up, so it's no wonder you're alarmed when you end a tough workout and your legs appear larger and more swollen than when you started. In most cases, swelling can be a result of microtrauma to your muscles that occurs when you exercise. (Don’t worry, these microtraumas help your muscles strengthen and grow). But sometimes, swelling in your legs can be a sign of an underlying health condition that needs medical attention.

Below, you’ll find five of the most common causes of swollen legs after working out. If you suspect you have one of these conditions or notice that your swelling hasn’t improved, it’s a good idea to see your healthcare provider for further support and individualized advice.

1. Microtrauma During Exercise

2. Injuries

If you have an injury or think you may have hurt yourself, it’s important to seek support immediately. Getting support from a healthcare provider can help you get the treatment you need — whether that’s a cast, a brace, or even just ice.

3. Underlying Diseases

However, exercise can also cause the excess fluid in your body to pool in your legs. As a result, the swelling becomes more pronounced right after you work out. If you’re noticing swelling in your legs both during a workout and when you’re resting, talk to your healthcare provider. They can get you tested for underlying health conditions and recommend appropriate treatment options if necessary.

4. Venous Disorders

While certain underlying diseases can certainly cause swelling in your legs, another reason you may experience swollen legs is due to venous disorders — which is just a fancy way of describing problems with the functioning of your veins.

But when you exercise your legs, blood flows more rapidly and in greater volumes to your legs, so it can exaggerate the swelling you’re already experiencing. If you think your swelling may be due to poor circulation, talk to your primary care provider or a vein specialist about testing and treatment. They can help you understand your diagnosis and recommend treatment options like medical-grade compression socks, certain lifestyle changes, or even minor procedures if necessary.

5. Pregnancy and Hormones

If you’re noticing swelling after exercise as you progress through your menstrual cycle, while pregnant, or during perimenopause, talk to your healthcare provider about what you can do to alleviate symptoms. They may recommend compression socks, elevation, and water-based workouts to keep your legs moving without the unwanted fluid retention.

The Takeaway

• When you exercise your legs, little tears in your muscles (known as microtraumas) can temporarily increase blood flow and cause swelling.
• Swelling after exercise is also a common symptom of an injury like a torn muscle, sprained ankle, or broken bone in your leg.
• Underlying health conditions and pregnancy can often contribute to swollen legs after exercising.
• If you have leg swelling after exercise that is bothersome or worsens, talk to your healthcare provider to get the support and treatment you need.