Deep vein thrombosis (DVT), a condition where blood clots form in deep veins, can lead to serious health consequences by blocking blood flow in veins or arteries. While external blood clotting is a natural process for healing injuries, internal clots pose a significant risk. The Centers for Disease Control and Prevention estimates that up to 900,000 Americans develop a DVT annually. This condition is not limited to the elderly or severely ill; recently, Philadelphia Eagles quarterback Jalen Hurts was diagnosed with DVT and bilateral pulmonary emboli, potentially sidelining him for the remainder of the 2026 season.

Dr. Vincent Varghese, an interventional cardiologist at Deborah Heart and Lung Center, emphasizes that DVTs can occur in younger individuals without apparent medical issues, highlighting the critical importance of awareness and education for early recognition.

Mechanisms of DVT Formation

Blood circulation is maintained by a delicate balance between the body's ability to form clots (thrombogenesis) and break them down (thrombolysis). This balance can be disrupted by acquired or inherited risk factors. Acquired risk factors include major events such as trauma, significant surgery, prolonged immobilization, or serious infections and cancer, according to Dr. K. Francis Lee, medical director of Advanced Vein Care Center.

The venous system, particularly in the legs and arms, relies on muscle contractions to pump blood back to the heart. When a person is immobilized, these muscles are less active, leading to slower blood flow and an increased risk of clot formation. Substances released into the bloodstream following trauma or surgery, such as tissue debris or collagen, can also trigger clotting. Damage to vein walls can similarly activate clotting mechanisms, as noted by the American Academy of Orthopaedic Surgeons.

An overall inflammatory response associated with these conditions can further activate the clotting cascade. Certain medications, including birth control pills and hormone replacement therapy, as well as diseases like heart failure, kidney disease, and cancer, can thicken the blood. Additionally, dozens of genetic conditions can predispose individuals to DVTs, early heart attacks, and strokes.

Dr. Lee advises that any family history of significant cardiovascular events or blood clots in younger family members (ages 20-40) should prompt investigation for underlying inherited genetic conditions.

COVID-19 has also been identified as a factor increasing DVT risk. Theories suggest the virus can induce an inflammatory state, leading to easier clot formation, and may directly damage the cells lining blood vessels, prompting clot development. Immobilization due to severe illness, particularly hospitalization, further exacerbates this risk by slowing blood flow.

For individuals at high risk of DVT, preventative anticoagulation therapy, especially upon hospital discharge, is recommended. Patients who develop a DVT while hospitalized should typically continue anticoagulation for several months post-discharge, as determined by their physician.

Protecting Yourself from DVT

Minimizing risk factors is crucial for preventing DVT. Key strategies include:

Recognizing Symptoms

Early signs of DVT can include swelling, pain, or tenderness in the leg, ankle, foot, or arm. Less common symptoms may involve hip or back discomfort, palpitations, fever, dizziness, coughing up blood-tinged sputum, or general fatigue. Prompt medical attention is advised if these symptoms persist or worsen.

Maintaining Mobility

Regular exercise and frequent movement are vital for improving blood circulation. Simple actions like walking breaks during sedentary periods, taking standing breaks, and stretching can help prevent blood from pooling. Pumping the feet while sitting can also boost circulation.

Medication Awareness

Certain medications, such as oral contraceptives and some chemotherapy drugs, can increase clot risk. Consultation with a doctor about prophylactic anticoagulation options is recommended when such treatments are unavoidable.

Compression Socks

Wearing compression socks can aid circulation by preventing blood from pooling in the veins. This is particularly beneficial during travel, after surgery, or during periods of inactivity.

Travel Precautions

During air travel, wearing loose clothing, staying hydrated, and moving around the cabin periodically can reduce DVT risk. Frequent changes in sitting position and avoiding crossed legs are also advised.

Smoking Cessation

Smoking impairs blood flow and elevates the risk of blood clots. Quitting smoking is a significant step in mitigating this risk.

Post-Surgery Protocols

Following major surgery, doctors often prescribe low-dose blood thinners or recommend compression devices and early ambulation to prevent clots. Adhering to post-operative protocols and maintaining close communication with healthcare providers is essential for a DVT-free recovery.

Family History

Investigating family history for events like early-onset heart attacks, strokes, DVTs, or recurrent pregnancy complications can identify potential inherited predispositions. Genetic or hematologic testing may be indicated in such cases, with family members advised to undergo testing if an abnormality is found.

When to Seek Medical Help

Sudden, persistent swelling, pain, or tenderness in a limb, particularly if it resembles a severe muscle cramp and does not resolve quickly, warrants immediate medical evaluation. Shortness of breath or sharp chest pains require emergency medical attention (call 911).

Medical professionals will conduct a physical exam and inquire about risk factors such as recent surgery, injury, cancer, stroke, heart failure, hormone use, or prolonged travel. Diagnosis typically involves ultrasound, with advanced imaging like CT scans, MRIs, or venograms used in complex cases.

Treatment commonly involves anticoagulant medications, which help dissolve clots. Newer blood-thinning medications offer improved safety and tolerability compared to older options like Warfarin. In severe cases, procedures to remove clots or surgery may be necessary. Early diagnosis and aggressive treatment are associated with better long-term outcomes.