A search for a missing man will resume for a fifth day amid fears for his welfare after disappearing into bushland northwest of Sydney during a camping party
Police and volunteers will return to Lower Portland, near Wisemans Ferry, on Friday to search for 24-year-old Tiemuzhen Chalaer.
He's been missing for five nights since Sunday with no supplies and no medication for his medical condition.
Hawkesbury Chief Inspector Garry Sims says police are concerned about Mr Chalaer due to his medical condition.
"We have very serious concerns for his health," he told AAP on Thursday.
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A team of 40 police officers and SES volunteers and a police dog have spent four days scouring bushland near the Wheelbarrow Ridge Road track in Lower Portland and will return at 9am on Friday.
