The cardiovascular system includes the heart and the blood vessels that carry blood to and from every part of the body. Symptoms such as chest discomfort, breathlessness, palpitations, swollen ankles, leg pain, or a cold foot can reflect problems in different parts of that system—but can also come from the lungs, kidneys, liver, nerves, muscles, medicines, or other causes. This guide helps you recognize patterns, prepare for assessment, and act quickly when time matters.
Key points
- New or unexplained chest pressure, severe shortness of breath, collapse, or signs of stroke require emergency assessment.
- Swelling is a symptom, not a diagnosis. It may result from prolonged sitting, veins, medicines, pregnancy, injury, infection, a clot, or heart, kidney, liver, thyroid, or lymphatic disease.
- Leg pain during walking that improves with rest can occur in peripheral artery disease, but examination and testing are needed.
- Blood pressure, cholesterol, blood sugar, smoking, activity, sleep, diet, family history, age, and other conditions all contribute to cardiovascular risk.
- Do not start, stop, or change heart, blood-pressure, blood-thinning, or fluid-removing medicines using general online advice.
How the heart and circulation work together
The right side of the heart receives blood returning from the body and pumps it to the lungs. The left side receives oxygenated blood from the lungs and pumps it through arteries to organs and tissues. Veins return blood to the heart, while tiny capillaries allow exchange of oxygen, nutrients, and waste products. The lymphatic system helps return excess tissue fluid and supports immune function.
A problem can occur in the heart muscle, valves, electrical rhythm, arteries, veins, or smaller vessels. Coronary artery disease limits blood flow to the heart muscle. Heart failure means the heart cannot fill or pump well enough for the body’s needs; it does not mean that the heart has stopped. Peripheral artery disease reduces arterial blood flow, commonly to the legs. Venous disease interferes with blood returning toward the heart. Fluid balance is also influenced by the kidneys, liver, hormones, medicines, and pressure within blood vessels.
These conditions can overlap. Someone with peripheral artery disease may also have plaque in arteries supplying the heart or brain. Heart failure can affect kidney function, and kidney disease can worsen blood pressure and fluid retention. A complete assessment therefore looks beyond the location of one symptom.
Heart attack symptoms: do not wait for certainty
Possible heart attack
Call the local emergency number for new or unexplained chest pressure, squeezing, fullness, heaviness, or pain—especially with shortness of breath, sweating, nausea, light-headedness, faintness, unusual weakness, or discomfort in an arm, shoulder, back, neck, jaw, or upper abdomen. Symptoms may be mild, may come and go, and may occur without dramatic chest pain.
A heart attack occurs when part of the heart muscle does not receive enough blood. The longer treatment is delayed, the more damage can occur. Women, older adults, and people with diabetes may have less typical or less intense symptoms. Unusual tiredness, nausea, breathlessness, back or jaw discomfort, or light-headedness can still be important.
Do not drive yourself if emergency medical transport is available. Emergency teams can begin assessment and treatment during transport. Do not delay the call while searching online, waiting for pain to become severe, or taking aspirin or another medicine based on general advice. The dispatcher or emergency clinician can give instructions appropriate to the situation.
Stroke symptoms: every minute counts
Possible stroke or transient ischemic attack
Call emergency services for sudden weakness or numbness of the face, arm, or leg—especially on one side—sudden trouble speaking or understanding speech, sudden vision change, sudden loss of balance or coordination, or a sudden severe headache without a known cause. Note when the symptoms began. If they disappear after minutes, urgent assessment is still required because this may be a transient ischemic attack.
The CDC’s B.E. F.A.S.T. reminder adds balance and eye changes to the familiar face, arm, speech, and time warning signs. A person should not drive themselves or wait for a routine appointment. Treatments are time-sensitive, and symptoms cannot be safely distinguished from other neurologic emergencies at home.
Breathlessness, fatigue, and heart failure
Heart failure can cause shortness of breath during activity, while lying flat, or during sleep; fatigue; cough; reduced ability to exercise; swelling in the feet, ankles, legs, abdomen, or neck veins; and a rapid change in weight from fluid. Symptoms vary with the type and severity. Older adults who are less active may notice weakness, sleepiness, or confusion rather than obvious exertional breathlessness.
These symptoms are not specific to heart failure. Lung disease, anemia, infection, kidney disease, deconditioning, sleep apnea, thyroid disease, and medicines can produce similar problems. A clinician may use history, examination, blood tests, an electrocardiogram, chest imaging, echocardiography, or other tests to identify the cause.
Sudden severe breathlessness, a feeling of suffocation, blue or gray color, confusion, fainting, chest pain, clammy skin, or coughing pink or bloody fluid is an emergency. Someone with known heart failure should follow the individualized monitoring and escalation plan provided by their clinical team rather than a generic threshold found online.
Swollen ankles and edema
Edema is swelling caused by fluid accumulating in tissues. It may affect one limb or both, may leave an indentation when pressed, and may make skin look stretched or shiny. Common non-emergency contributors include long periods of sitting or standing, pregnancy, high salt intake, varicose veins, and certain medicines. Other causes include injury, infection, a blood clot, and heart, kidney, liver, thyroid, or lymphatic disease.
The pattern matters. New swelling in one leg—especially when painful, warm, red, or sudden—needs urgent assessment for causes that include deep vein thrombosis or infection. Bilateral swelling with increasing breathlessness, difficulty lying flat, abdominal swelling, or rapid deterioration may reflect heart or another organ problem. Swelling of the face or tongue with breathing difficulty can be a severe allergic reaction and requires emergency care.
Do not take a borrowed “water pill,” increase a prescribed diuretic, or sharply restrict fluids without clinical advice. Fluid-removing medicines can alter blood pressure, kidney function, and electrolytes, and edema treatment depends on the cause. Compression garments are useful for some venous or lymphatic conditions but may be unsuitable when arterial circulation is poor or another urgent problem is present.
Leg pain and peripheral circulation
Peripheral artery disease, or PAD, commonly results from atherosclerotic plaque reducing blood flow to the legs. A typical symptom is muscle aching, cramping, heaviness, or weakness that starts with walking or exercise and improves after rest. Some people have no symptoms, while others notice a slow-healing wound, reduced hair growth, temperature or color change, or pain at rest when disease is advanced.
Vein problems, arthritis, muscle injury, spinal conditions, and neuropathy can resemble PAD. A clinician checks pulses, skin, wounds, risk factors, and the relationship between symptoms and activity. The ankle-brachial index compares blood pressure at the ankle and arm and is a common first test; additional imaging may be needed.
Possible acute limb ischemia
Seek emergency help if a foot or leg suddenly becomes very painful, pale or blue, cold, numb, weak, or impossible to move. A sudden loss of arterial blood flow can threaten the limb and needs rapid treatment.
Palpitations, dizziness, and fainting
Palpitations are an awareness of the heartbeat as racing, pounding, fluttering, skipping, or irregular. They can occur with exercise, stress, fever, dehydration, caffeine, nicotine, alcohol, medicines, anemia, thyroid disease, or a heart-rhythm disorder. A brief isolated sensation may be benign, but symptoms cannot be classified by feeling alone.
Seek emergency care when palpitations occur with chest pain, severe breathlessness, fainting, new neurologic symptoms, or persistent instability. Unexplained fainting during exercise, recurrent fainting, or fainting in someone with known heart disease needs prompt assessment. An electrocardiogram records only the rhythm during the test; intermittent symptoms may require longer monitoring.
How cardiovascular risk is assessed
Risk assessment combines current conditions and future probability. A clinician may review blood pressure, cholesterol, blood sugar, kidney function, smoking, family history, age, pregnancy history, weight pattern, activity, diet, sleep, and social factors. A risk calculator can support shared decisions but does not predict an individual event with certainty and may not apply equally to every population.
High blood pressure and high cholesterol often cause no symptoms, so measurement matters. One reading is not always enough to diagnose hypertension; technique, repeated measurements, and sometimes home or ambulatory monitoring are important. Cholesterol interpretation depends on the complete lipid profile and overall cardiovascular risk rather than one number alone.
Testing should answer a clinical question. Depending on symptoms, examination, and risk, this may include blood tests, electrocardiography, echocardiography, exercise testing, vascular ultrasound, CT or MRI imaging, or invasive tests. More testing is not automatically safer when the probability of disease is low, because false-positive results can lead to unnecessary procedures.
Protecting heart and circulation health
Do not smoke, and seek evidence-based cessation support if you do. Regular physical activity improves cardiovascular fitness and several risk factors, but people with new chest symptoms, unexplained breathlessness, fainting, or severe exercise-related leg pain should be assessed before pushing intensity. Break up prolonged sitting when possible.
A heart-supportive eating pattern emphasizes vegetables, fruit, whole grains, legumes, nuts, fish or other appropriate protein sources, and unsaturated fats while limiting excess sodium, highly processed foods, and trans fats. NHLBI research on the DASH pattern shows benefits for blood pressure and LDL cholesterol. This is a pattern, not a universal prescription; kidney disease, heart failure, diabetes, eating disorders, allergies, and cultural needs can require adaptation.
Use prescribed medicines consistently and report side effects rather than stopping abruptly. Ask how blood pressure, cholesterol, diabetes, and other conditions will be monitored. Sleep disorders, chronic stress, depression, access to food and care, unsafe housing, and work conditions can affect cardiovascular health; a realistic plan should address barriers rather than assume that risk is purely a matter of personal choice.
Questions people often ask
Are swollen ankles always a heart problem?
No. Edema has many possible causes, including veins, medicines, pregnancy, injury, infection, blood clots, and kidney, liver, thyroid, lymphatic, or heart conditions. New, persistent, painful, sudden, or unexplained swelling needs assessment.
Can chest pain be indigestion or anxiety?
Yes, but heart problems can also resemble indigestion or anxiety. New or unexplained chest symptoms, especially with breathlessness, sweating, nausea, weakness, or radiating discomfort, should be treated as an emergency until assessed.
Does “poor circulation” explain cold hands and feet?
Not necessarily. Temperature, normal vessel responses, anemia, thyroid disease, nerve conditions, medicines, and arterial disease can all contribute. Sudden one-sided coldness, color change, pain, numbness, or weakness is urgent.
Can I prevent every heart attack or stroke with lifestyle changes?
No. Healthy behaviors and appropriate treatment lower risk but do not remove age, genetics, prior disease, or every medical and social factor. Prevention includes screening, treatment, and emergency awareness as well as lifestyle.
Sources and evidence scope
This guide was researched using current CDC guidance on heart attack symptoms and May 2026 stroke warning signs; National Heart, Lung, and Blood Institute guidance on heart failure, peripheral artery disease, and the DASH evidence base; and the NHS February 2026 overview of edema. Evidence and guidance were checked on August 20, 2026. Emergency numbers, diagnostic pathways, risk thresholds, and treatment recommendations vary by country.
Guides in this topic
Edema and Fluid Retention: Causes, Warning Signs and Treatment
Edema, also spelled oedema, means swelling caused by fluid accumulating in body tissues. It is a sign, not a diagnosis. A warm day or hours of standing can cause mild ankle swelling, but the same visible symptom can also come from a blood clot, heart failure, kidney or liver disease, damaged veins or lymph vessels, pregnancy complications, infection, injury, or medicine.