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Bella Hadid is sparking concern for her health after posting a series of photos from a hospital bed ... where she is seen hooked up to several IVs, receiving an undisclosed treatment.

The supermodel issued the cryptic update on her Instagram Wednesday, where she apologized to her fans for always going "MIA." She signed off her note with an "I love you" message ... prompting an outpouring of well wishes in response.

Sister Gigi Hadid even chimed in, writing in the comments ... "I love you! I hope feel as strong and good as u deserve, soon!!!!!!"

There's currently no word on the reason behind Bella's hospital stint, but she's been open about her Lyme disease struggles in the past.

Remember, Bella was diagnosed with the bacterial infection, which is transmi

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