Overview
Blood vessels are part of the circulatory system. They carry blood from the heart to the body and back again. Arteries usually carry oxygen-rich blood away from the heart, veins usually carry blood back to the heart, and capillaries connect them through very small channels in tissues. Blood vessels also help regulate body temperature, blood pressure, and the delivery of nutrients and hormones.
Key Symptoms
Healthy blood vessels usually do not cause symptoms that a person can feel. Problems affecting blood vessels may lead to chest pain, shortness of breath, leg pain when walking, swelling, numbness, weakness, skin color changes, or wounds that heal poorly. Symptoms depend on which part of the body is affected. Some blood vessel conditions develop slowly, while others happen suddenly.
Causes and Risk Factors
Blood vessel problems can happen when vessels become narrowed, blocked, stretched, inflamed, or weakened. Risk factors can include smoking, high blood pressure, diabetes, high cholesterol, older age, family history, obesity, physical inactivity, and some infections or autoimmune conditions. Injury and blood clots can also affect blood flow. Risk may differ depending on whether arteries, veins, or capillaries are involved.
Who Is Affected
Everyone has blood vessels and anyone can develop a blood vessel problem. Some conditions are more common with aging, while others can affect younger people, including people born with vessel abnormalities. Pregnancy can increase the chance of some vein problems. People with long-term conditions such as diabetes or high blood pressure may have higher risk of vessel damage over time.
Prevention
Many blood vessel problems may be lowered by not smoking, being physically active, eating a balanced diet, managing stress, and getting enough sleep. Regular health checks can help detect high blood pressure, diabetes, and high cholesterol early. Following a clinician's advice for long-term conditions can help protect the heart, brain, kidneys, eyes, and limbs. Avoiding prolonged immobility may also reduce the risk of some blood clots.
Diagnosis and Tests
Healthcare professionals assess blood vessel health using a medical history, physical examination, and blood pressure measurement. Depending on symptoms, tests may include blood tests, ultrasound, ankle-brachial index, CT scans, MRI, or angiography to look at blood flow and vessel structure. Heart tracing tests or other organ-specific tests may also be used if reduced blood flow is suspected. The choice of testing depends on the part of the body involved and how urgent the symptoms are.
Treatment Categories
Treatment depends on the specific blood vessel problem and how severe it is. Care may include lifestyle changes, treatment of underlying conditions, medicines chosen by a healthcare professional, compression therapy for some vein conditions, or procedures to open, repair, or remove damaged vessels. Emergency treatment may be needed if blood flow is suddenly blocked or if a vessel ruptures. Ongoing follow-up is often important to reduce complications.
Diet and Lifestyle
Daily habits can strongly affect blood vessel health. A pattern of eating rich in vegetables, fruits, whole grains, beans, nuts, and healthier fats may support the heart and circulation, while limiting tobacco and highly processed foods may help lower risk factors. Regular movement supports blood flow, and breaking up long periods of sitting can be helpful. If you drink alcohol, staying within local public health guidance may reduce harm.
When to Seek Medical Care
Seek medical care if you have ongoing leg pain, swelling, skin ulcers, color changes in fingers or toes, chest discomfort with activity, or symptoms that suggest poor circulation. New numbness, weakness, severe headaches, or vision changes also need prompt medical attention because blood vessel problems can affect the brain and eyes. If you have risk factors such as diabetes, high blood pressure, or smoking, regular checkups are important even if you feel well.
When It May Be an Emergency
Get emergency help right away for sudden chest pain, trouble breathing, signs of stroke such as face drooping or one-sided weakness, sudden severe leg pain with a cold or pale limb, heavy bleeding, or sudden collapse. These can happen when a blood vessel is blocked, torn, or bleeding. Fast treatment can reduce the risk of permanent damage or death.