Not necessarily. However, you should still get them checked out because it may come from a retinal tear, which is dangerous. Symptoms can include a lot of new floaters with flashes of light and a dark shadow in your central vision. On some occasions, patients that have inflammation of the vitreous can report floaters. However, those are not real floaters, but white blood cells that cast a shadow over the retina. They're often resolved when the inflammation is treated. Other causes include bleeding inside the eye, which can happen in patients with uncontrolled diabetes, retinal tear, and retinal detachment.
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