"Needles" is the second song in System of a Down's album Toxicity, connected to the previous track "Prison Song".
It was written by Serj Tankian and Daron Malakian. The lyrics, are about drug (such as heroin) abuse and its dangers. Just like having a tape worm, you keep feeding this addiction without ever being "nourished". The more you feed it the bigger it gets and the less you get from it. After the second chorus, there is a bass riff that leads into bridge, where Malakian the guitarist sings "I'm sitting in my room with a needle in my hand. .