Question
What symptoms after treatment need a doctor right away?
After treatment, the useful question is which symptoms justify a call right away rather than waiting for the next appointment. This page sticks to what one named source lists, which keeps the answer checkable.
The short list
Four groups of symptoms are named: open sores where you were injected, signs of a blood clot in the leg, severe breathing trouble or chest pain, and problems with vision or balance. Any of them is a reason to contact your doctor or seek care at once, according to the source below.
What Kaiser Permanente writes
Kaiser Permanente's home-care guidance for sclerotherapy says: "Contact your doctor now or seek immediate medical care if: You get open sores on your legs where the chemical was injected. You have symptoms of a blood clot in your leg (called deep vein thrombosis), such as: Pain in the calf, back of the knee, thigh, or groin."
The same source also lists: "Swelling in the leg or groin. A color change on the leg or groin." It names whole-body signs as well: "You have severe trouble breathing. You have sudden chest pain and shortness of breath, or you cough up blood." The last item reads: "You have problems with your vision or balance."
Reading the list with care
This list comes from home-care guidance for sclerotherapy, so it was written for that procedure. If you had a different procedure, ask your clinic whether the same signs apply, and follow your own discharge instructions where they differ from a general page.
Notice that the list mixes local signs in the leg with whole-body ones. The clot is the later failure the source names, and the breathing and chest items sit beside it as separate urgent signs.
Making the call
Write the signs down and keep the clinic's number where you will find it, then ask which symptoms the clinic wants to hear about the same day. For further reading, see this page on spider vein treatment recovery, Kaiser Permanente's guide to what to expect at home after sclerotherapy, and RadiologyInfo.org on evaluating and treating varicose veins.
The cost of finding out late
A list like this is cheap to keep and expensive to discover late. Ask whether your visit schedule includes an early check, since a booked visit is a cheaper way to catch a problem than a symptom that forces the call.