A bruise forms when small blood vessels under the skin break after an injury, causing blood to pool and discolour the area. While most bruises are harmless, deeper injuries can sometimes lead to blood clots. According to a study published in the Archives of Internal Medicine, even minor leg injuries like sprains can increase the risk of deep vein thrombosis (DVT). DVT is a serious condition where a clot forms in a deep vein, often in the legs. If the clot travels to the lungs, it can cause a life-threatening pulmonary embolism. Early detection is key to preventing serious complications. Symptoms such as swelling, pain, redness, or warmth in the leg should prompt immediate medical attention to reduce health risks.Understanding bruises and blood clots A bruise, medically known as a haematoma, occurs when small blood vessels beneath the skin break due to an injury. This causes blood to leak and pool under the skin, resulting in the familiar discoloration and tenderness. Bruises are generally harmless and heal on their own within a couple of weeks.A blood clot, on the other hand, is a thicker, gel-like collection of blood that forms inside blood vessels to stop bleeding. While clots are essential to prevent excessive bleeding after injury, they can become dangerous if they form inside veins or arteries and block normal blood flow.From bruises to blood clots: Warning symptoms to monitorOccasionally, what looks like an ordinary bruise could signal something more serious. Monitor carefully if you notice:Persistent bruising lasting more than two weeks, without any visible signs of healing or fadingA bone-deep lump or firm swelling under the skin that doesn’t reduce or subside over timeWarmth, redness, or ongoing swelling around the affected area that worsens or remains constantPain that intensifies progressively, especially if it resists usual pain relief measures or medicationNoticeable vein prominence or cord-like structures clearly visible near the surface of the skinIf a clot dislodges, urgent symptoms may follow, sharp chest pain, sudden breathlessness, rapid heartbeat, or coughing up blood, professional emergency care is imperative.Who is at higher risk of clots after bruisingSome individuals have an elevated clotting risk following injury:1. People aged 60 plus, or those with mobility limitationsReduced movement can slow blood flow, increasing the risk of clot formation.2. Individuals with genetic clotting disorders or a family history of DVTInherited conditions can predispose individuals to abnormal blood clotting.3. Smokers, especially combined with other risk factorsSmoking damages blood vessels and affects circulation, raising clot risk.4. Users of hormone-based treatmentsCertain hormone therapies can increase blood coagulability, contributing to clots.5. Those with recent long-haul travel, prolonged bed rest, or dehydrationExtended immobility and dehydration can lead to sluggish blood flow and clotting.Diagnosis and treatment optionsHealthcare professionals may investigate suspected clots using:Ultrasound scans to visualise clots in veinsCT or MRI imaging for deeper or unclear areasBlood tests, such as D-dimer levels, though they may require contextTreatment protocols may include:Blood thinners to inhibit clot growthSurgical or catheter-based clot removal, if necessaryCompression stockings to aid circulation and reduce swellingLifestyle guidance such as early ambulation, hydration, and compression therapyPreventative measures after injuryTo reduce clot risk:Apply ice compresses for 24-48 hours after a bruise, then switch to gentle heat to stimulate blood flowStay active-stand, walk, or gently flex your legs regularly, especially during recovery or travelMaintain hydration and minimise alcohol during healing periods, which supports circulationElevate injured limbs when resting to reduce blood pooling and swellingDisclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making any changes to your health routine or treatment.Also read | Do kidney stones increase the risk of kidney cancer? Understanding the link between the two