The shooting happened at about 9 a.m. in the 5700-block of North Broadway in the Edgewater neighborhood, police said.
A woman, 23, was in an argument with a man, police said.
The man then pulled out a gun and shot the woman in the left shoulder, police said.
She was rushed to an area hospital in serious condition.
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The suspect allegedly ran off; however, police said he was promptly taken into custody.
Charges are pending.
Ald. Leni Manaa-Hoppenworth said in a letter to residents that the incident appears to be possible road rage.
Manaa-Hoppenworth said the woman's injuries were non-life threatening.
Anyone with information on the incident should contact Area Three detectives at 312-744-8261.
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