What Should We Pay Attention to Before and After Sclerotherapy?

What is sclerotherapy?

Sclerotherapy is an injection-based treatment used for selected veins. A clinician injects a sclerosing solution into the target vein. The solution irritates the inner lining of that vein, leading it to close over time. Blood is then carried through other veins. The treated vein gradually becomes less visible or is absorbed by the body, although the timing and degree of change vary.

The technique may be used for certain small visible veins and, depending on the clinical findings, for some larger veins. Liquid and foam sclerotherapy are different ways of delivering the solution. Ultrasound guidance may be used when the target vein is deeper or cannot be seen clearly at the skin surface.

Sclerotherapy is not simply a cosmetic procedure in every case. Some patients seek advice because visible veins affect their appearance; others have symptoms or a vein problem that requires assessment. The appropriate approach depends on the vein pattern, symptoms, examination findings and, when indicated, ultrasound results.

If you would like an overview of the treatment itself, see our sclerotherapy and foam sclerotherapy treatment page .

Is sclerotherapy suitable for everyone?

No single vein treatment is suitable for every person or every vein. Before recommending sclerotherapy, a clinician considers your symptoms, medical history, the veins being assessed and your treatment goals. An examination may be enough for some visible superficial veins. For other symptoms or vein patterns, Doppler ultrasound may be recommended to evaluate blood flow and identify whether a deeper vein problem needs to be addressed.

Make sure your clinician knows if you are pregnant, breastfeeding, planning a pregnancy, have previously had a blood clot, have a known clotting disorder, have a significant medical condition, or have had a reaction to a medicine or injection solution. These details do not automatically determine whether treatment can or cannot be done, but they may affect clinical decisions and timing.

Tell the clinician about all medicines and supplements you take, including prescription medicines, non-prescription pain relievers, vitamins and herbal products. Some medicines may affect bleeding or treatment planning. Do not stop, start or change a prescribed medicine unless the clinician who manages it tells you to do so.

Your clinician may discuss alternative options if sclerotherapy is not appropriate for the veins being assessed. Depending on the findings, these may include observation, compression for symptom management, another minimally invasive treatment or a different care plan. Ask why an option is being recommended and what its benefits, limitations and possible risks are in your situation.

What to do before sclerotherapy

Your clinic should provide instructions based on the planned treatment. The following points can help you prepare for the appointment, but they do not replace the directions given by your own clinician.

Share your health and medication history

Before the procedure, provide an accurate list of your medicines and supplements. Mention previous vein treatments, allergies, prior blood clots, bleeding problems, recent or planned surgery, pregnancy or breastfeeding, and any new symptoms. Also tell your clinician if you have recently been unwell or if your health has changed since the consultation.

Do not withhold information because you think it is unrelated. A clinician can decide which details matter for your treatment and whether any additional assessment is needed.

Ask about food, drink and your usual medicines

Instructions about eating, drinking and taking regular medicines depend on the treatment plan and the medicines involved. Some appointments may not require fasting, while other circumstances can call for specific instructions. Confirm these details with the clinic before the day. Do not assume that you should fast or alter medication based on general online advice.

Ask whether an ultrasound assessment is planned

Ultrasound is not required in exactly the same way for every person. Your clinician may recommend Doppler ultrasound when symptoms, visible veins or examination findings suggest that the underlying circulation should be assessed. Ask whether your appointment includes imaging, and whether you need to bring previous scan results or treatment records.

Choose practical clothing

Wear comfortable clothing that allows the clinician to examine the relevant area and that is easy to put back on afterward. If you have been instructed to bring a compression garment, bring the specific garment requested. Do not buy a particular pressure level or size without advice about what is appropriate for you.

Plan your journey and the rest of your day

Ask the clinic whether you can drive after your appointment and whether you need someone to accompany you. The answer can depend on the treatment plan, any medicines given and your individual circumstances. If you are travelling a long distance, ask whether you should plan breaks for walking or movement.

It may also be useful to keep the rest of the day flexible in case the treatment area feels tender or you need extra time at the clinic. Follow the specific arrival and appointment instructions provided by your care team.

What happens on the day of treatment?

Before treatment begins, the clinician may review your symptoms and medical history, examine the area and confirm the planned veins. If ultrasound guidance is appropriate, it may be used to locate or monitor the target vein. You should have the opportunity to ask questions and confirm that you understand the planned procedure.

The skin is cleaned, and the sclerosing solution is injected into the selected vein through a fine needle. The number of injections depends on the veins being treated and the treatment plan. Some people feel brief stinging, cramping or pressure. Tell the clinician if you feel significant pain or anything that concerns you during the procedure.

After the injections, the clinician may apply a dressing or compression garment, or give you other instructions. You may be asked to walk or move around before leaving. The clinic will explain what to expect, whom to contact with questions, and whether a follow-up appointment or additional session is recommended.

Do not compare your appointment instructions with another patient’s schedule and assume they should be identical. The number and location of treated veins, the technique used and your health history can all affect the plan.

What to do after sclerotherapy

Your clinician’s aftercare instructions take priority over general information in this article. They may specify how long to wear compression, whether to use a dressing, when to shower, what activities to avoid temporarily and when to return for review.

Walk and move as instructed

Many people are encouraged to walk after sclerotherapy, but the exact advice depends on the treatment and the person. Follow the clinic’s directions about walking and your normal daily routine. Avoid remaining still for prolonged periods unless you have been told otherwise, and ask what to do if your mobility is limited or your work involves long periods of standing or sitting.

Follow your compression instructions

Compression may be recommended for some sclerotherapy treatments. The garment, fit and wearing schedule are not universal. Ask your clinician when to put it on, how long to wear it, whether it should be removed at night, and what to do for bathing. If the garment causes marked pain, numbness, skin irritation or a change in skin colour, contact your care team for advice.

Do not roll, cut or alter a compression garment unless your clinician or the manufacturer specifically instructs you to do so. If you have difficulty putting it on or are unsure whether it fits correctly, request help rather than forcing it.

Ask when to resume strenuous exercise

Advice about running, heavy lifting, high-impact exercise and strength training can vary with the size and location of the treated veins and the technique used. Confirm your personal timeline with the clinician. Gentle movement and strenuous exercise are not the same thing; do not interpret advice to walk as permission to resume every activity immediately.

Check before using heat or exposing the area to strong sun

Your clinician may advise you to avoid certain heat exposures or direct sun on the treated area for a period of time. The reason and duration depend on the treatment and your skin. Ask specifically about hot baths, saunas, sunbathing and outdoor activities. Do not apply heat packs or cold packs to the area unless your clinician says they are appropriate.

Use medicines only as directed

If you have discomfort, ask which pain relief is suitable for you, particularly if you take blood thinners, have a bleeding condition, have allergies or have been advised to avoid particular medicines. Do not start anti-inflammatory medicines, creams or supplements for the treated area without checking that they are appropriate.

Keep your follow-up appointment

Follow-up allows your clinician to review how the treated area is responding and decide whether any additional care is needed. Some veins change gradually over several weeks or longer. The timing of visible improvement varies, and more than one session may be considered. Attend the review recommended for you, even if the area seems to be improving.

What may be normal during recovery?

Temporary tenderness, bruising, mild swelling, redness, itching or small areas of firmness can occur after injections. Some treated veins may feel like a small cord or lump for a time. Temporary skin discolouration can also occur. These effects vary from person to person and do not necessarily mean that treatment has failed.

Improvement is usually gradual rather than immediate. The appearance of treated veins may change over weeks or months, and the timeline depends on the vein size, treatment method and individual response. Some people need more than one session. New veins may also develop later, because treatment of selected veins does not prevent every future vein from appearing.

Do not squeeze, massage, puncture or apply unapproved creams to a treated area. If you are unsure whether a symptom is expected, contact the clinic that performed the treatment and describe when it started, where it is located and whether it is changing.

When to contact a clinician

Contact your clinic if you develop symptoms that are severe, worsening or outside the instructions you were given. These may include increasing pain, significant redness or warmth, a wound, unusual discharge, persistent bleeding, extensive swelling or a skin change that concerns you. Your treating clinician can advise whether you need an examination.

Sudden swelling or pain in one leg, particularly when accompanied by warmth, redness or tenderness, needs urgent medical assessment. These symptoms can have more than one cause, and an online article cannot diagnose them.

Seek emergency medical care if you develop sudden shortness of breath, chest pain, fainting or coughing up blood, especially after a procedure or alongside leg symptoms. Do not wait for a routine follow-up appointment in an emergency.