Collapsed veins occur due to restricted blood flow caused by inflammation from repeated needle use or drug irritation. They can be temporary or permanent, with varying symptoms.

Signs and Symptoms: Look out for discoloration, swelling, itching, bruising, or cold hands/feet due to poor circulation. Veins may disappear under the skin, and blood flow stops.

Causes: Repeated needle use, blunt needles, wrong injection techniques, and injecting irritating substances can lead to collapsed veins...

Check: https://www.healthsoothe.com/collapsed-vein/