The injection site has been painful during intravenous infusion.

Under normal circumstances, persistent pain at the injection site during intravenous (IV) infusion may be related to factors such as excessively fast drip rate, drug irritation, improper puncture, allergic reactions, or blood congestion. Patients are advised to follow medical instructions for symptomatic treatment. Specific analyses are as follows:

1. Excessively Fast Drip Rate

If the IV drip rate is too fast, it often leads to a high drug concentration, which can irritate the blood vessel walls and cause continuous pain at the injection site. It is recommended that patients adjust the drip rate under a doctor's guidance, which usually helps alleviate the discomfort.

2. Drug Irritation

Certain IV medications may be inherently irritating and can cause local irritation at the injection site, potentially leading to ongoing pain. If symptoms are mild and no other discomfort is present, special treatment is usually unnecessary. However, if the pain is severe, patients should promptly consult their doctor about switching medications under medical supervision, which can effectively relieve the pain.

3. Improper Puncture

If the needle is not properly inserted during IV administration, it may penetrate the blood vessel wall, causing fluid to accumulate under the skin and resulting in pain at the injection site. It is recommended that a healthcare provider re-perform the puncture. Applying ice packs after the infusion may help reduce discomfort.

4. Allergic Reaction

Some components in IV medications may trigger allergic reactions in certain individuals, requiring immediate medical attention. In cases of allergy, medications should be administered under a doctor’s guidance to prevent adverse effects. Patients may be prescribed antihistamines such as loratadine tablets or cetirizine hydrochloride capsules under medical supervision.

5. Blood Congestion

Pain at the injection site may also result from localized blood congestion. Accumulated blood increases venous pressure, leading to pain around the puncture site. This condition typically does not require specific treatment; encouraging gentle movement and light massage of the affected area may effectively relieve symptoms.

In addition, persistent pain might also be associated with decreased immunity or long-term intravenous injections. If patients experience any discomfort, they should seek timely medical evaluation at a hospital to avoid delays in diagnosis and treatment.