Baghdad blasts in Shi'ite areas kill 31

At least 31 people have been killed in a string of car bomb attacks across Baghdad.

At least 31 people have been killed in a string of car bomb attacks across Baghdad. (AAP)

A wave of car bombs has struck Shi'ite-majority areas of Baghdad, killing at least 31 people, security and medical officials say.

The six car bombs, which hit five different areas of the Iraqi capital on Saturday, also wounded more than 90 people.

The deadliest single attack struck Sinaa Street in Baghdad's central Karrada district, killing at least 10.

Baghdad is hit by near-daily bombings and shootings, some of which have been claimed by the Islamic State jihadist group, which has overrun large parts of the country since June.

IS and other Sunni extremist groups consider Shiites to be heretics and frequently target them in attacks.