Between 2.30pm and 2.40pm on Monday, December 15, the man was reportedly pushed following attempts to stop a teenage boy from stealing at Iceland Foods in Victoria Street.
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Enquiries are being carried out, including a review of CCTV, and officers are encouraging anyone with information about the incident or suspect to come forward.
Information can be reported online at herts.police.uk/report, you can speak to an operator in the Force Communications Room via web chat at herts.police.uk/contact, or call the non-emergency number 101, quoting 41/118821/25.
Alternatively, you can stay anonymous by contacting the independent charity Crimestoppers on 0800 555 111, or via their untraceable online form at crimestoppers-uk.org.