Most stings occur during the summer wet season in October–May in North Queensland, with different seasonal patterns elsewhere. Because the jellyfish are very small, the venom is only injected through the tips of the nematocysts (the cnidocysts) rather than the entire lengths; as a result the sting may barely be noticed at first. It has been described as feeling like little more than a mosquito bite. The symptoms, however, gradually become apparent and then more and more intense in the subsequent 5 to 120 minutes (30 minutes on average).<unk>  includes an array of systemic symptoms, including severe headache, backache, muscle pains, chest and abdominal pain, nausea and vomiting, sweating, anxiety, hypertension, tachycardia, and pulmonary edema. Symptoms generally improve in four to 30 hours, but may take up to two weeks to resolve completely. Toxicity When properly treated, a single sting is almost never fatal; however, two people in Australia are believed to have died from<unk>  stings, which has greatly increased public awareness of<unk> . It is unknown how many other deaths from<unk>  have been wrongly attributed to other causes.
Irukandji syndrome
Larsen syndrome
Elejalde syndrome
Carpenter syndrome
Bart–Pumphrey syndrome
Jeavons syndrome
McGillivray syndrome
Patau syndrome