After taking spirulina i have red spots on the roof of mouth, it feels like something is stuck in throat & red line down uvula. should i seek er?

Low concern: Little is known about the various side effects of taking blue-green algae, but hypersensitivity is always a heightened concern when taking natural products. Your symptoms are not consistent with anaphylaxis, but more likely with local irritation or delayed-type sensitization. An Allergist can help you to decide if this is the right supplement for you!