Phlebitis (Flebitis): What It Is, Symptoms, and When to Worry
Medically verified
Last updated on 1/29/2026
By Dr. Michael Nguyen
Vein Doctor at Vein Treatment Clinic
Harvard Medical School
Board Certified by the American Board of Venous and Lymphatic Medicine
Phlebitis is a condition in which a vein becomes inflamed, often causing pain, redness, and tenderness along the course of the vein.
Many patients search for “flebitis,” which is a common misspelling of phlebitis. Both terms are used to describe the same condition involving vein inflammation.
Phlebitis before and after treatment pictures.
Results may vary according to each case.
Phlebitis before and after treatment pictures.
Results may vary according to each case.
This page explains what phlebitis is, why it happens, what symptoms to watch for, and when evaluation or treatment may be necessary.
If you have a painful, red, or tender vein and are unsure what’s causing it, a vein evaluation can help clarify whether phlebitis or another vein condition is present.
What is phlebitis?
Phlebitis refers to inflammation of a vein, most commonly affecting veins in the legs.
It can involve superficial veins close to the skin or deeper veins, depending on the underlying cause.
Why do people spell phlebitis as “flebitis”?
The term phlebitis comes from Greek, where “ph” is pronounced like an “f.”
Because of this, many patients spell or search for the condition as “flebitis,” even though the correct medical spelling is phlebitis.
What are common symptoms of phlebitis?
Common symptoms include localized pain, redness, warmth, and tenderness along a vein.
The vein may feel firm or cord-like under the skin.
Symptom Checker
What causes phlebitis?
Phlebitis can be caused by irritation or injury to a vein, sluggish blood flow, or increased vein pressure.
It is more common in veins affected by varicose veins or chronic venous insufficiency.
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What is superficial phlebitis?
Superficial phlebitis affects veins close to the surface of the skin.
It is often uncomfortable but usually less dangerous than deeper vein conditions.
How is phlebitis different from a blood clot?
Phlebitis refers to vein inflammation, while a blood clot involves coagulated blood blocking a vein.
In some cases, phlebitis and clotting can occur together, which is why evaluation is important.
Table of contents
1. What is phlebitis?
2. Why do people spell phlebitis as “flebitis”?
3. What are common symptoms of phlebitis?
4. What causes phlebitis?
5. What is superficial phlebitis?
6. How is phlebitis different from a blood clot?
7. Is phlebitis dangerous?
8. How is phlebitis diagnosed?
9. How is phlebitis treated?
10. When should you see a vein specialist for phlebitis?
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A 37-year-old patient visited our Vein Treatment Clinic, seeking relief from unsightly and painful varicose and spider veins. We performed radiofrequency ablation and sclerotherapy treatments, significantly improving the veins’ appearance and completely eliminating discomfort. The patient is now enjoying a more active and pain-free lifestyle.
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At our Long Island Vein Clinic, we treated this 75 year-old patient with spider veins using radiofrequency ablation and sclerotherapy. These minimally invasive treatments improved both the patient’s appearance and overall well-being, offering transformative results.
Before
After
This 75 year-old patient visited our Long Island Vein Treatment Clinic with painful spider veins. We used radiofrequency ablation and sclerotherapy, minimally invasive treatments, to eliminate the veins and restore comfort and confidence. The patient experienced life-changing results
Is phlebitis dangerous?
Superficial phlebitis is often not dangerous but can be painful and disruptive.
However, symptoms should always be evaluated to rule out deeper vein involvement.
How is phlebitis diagnosed?
Diagnosis begins with a physical exam and review of symptoms.
Ultrasound may be used to determine whether deeper veins are involved or if a clot is present.
How is phlebitis treated?
Treatment depends on severity and cause, and may include compression, movement, and addressing underlying vein disease.
When phlebitis is related to varicose veins or venous insufficiency, treating the underlying condition can reduce recurrence.
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When should you see a vein specialist for phlebitis?
Evaluation is recommended if symptoms are severe, worsening, spreading, or associated with swelling.
A vein specialist can determine whether treatment or monitoring is appropriate.
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