Phlebitis is also sometimes known as superficial thrombophlebitis or superficial vein thrombosis.

Phlebitis usually affects the veins in the legs, but you can also get it in your arms or neck. It can develop within hours or over a few days.

The main symptoms are:

• pain, tenderness or swelling in the affected area
• warm and itchy skin over the affected area
• changes to the colour and texture of the surrounding skin – for example, the skin may be red, and it may be thick and hard

Ask for an urgent GP appointment or get help from NHS 111 if you have:

Treatment for phlebitis may not be needed if your symptoms are mild.

But treatment may be recommended if your symptoms are severe or do not go away.

Treatments may include:

• anti-inflammatory medicines – cream or gel can be used if the affected area is small
• compression stockings – these increase blood flow to the legs but are only suitable for some people with phlebitis and should be recommended and fitted by a health professional
• blood-thinning medicine to reduce the risk of DVT or further blood clots, and help stop phlebitis coming back

There are things you can do to help ease the pain and discomfort of phlebitis.

It's not always clear what causes phlebitis.

Often the inflammation is linked to:

• varicose veins (swollen and enlarged veins, usually in the legs)
• conditions that cause the blood to clot more easily like thrombophilia
• autoimmune conditions like Behçet's disease (a rare condition that causes inflammation of the blood vessels)
• having injections or a small plastic tube (cannula) inserted into a vein

Other things that can increase your chances of getting phlebitis include:

• getting older
• living with obesity
• being pregnant
• having cancer
• having phlebitis in the past
• smoking
• hormonal treatments, such as hormone replacement therapy (HRT)