For example, the initial symptoms in chronic warfarin poisoning are back pain and abdominal pain. Acute poisoning with DNOC usually runs a rapid course. Death or almost complete recovery within 24 to 48 hours is the general rule. Methyl bromide is extremely dangerous because a toxic or even fatal dose can be absorbed before symptoms appear. Many fumigants can also cause severe chemical burns when trapped against the skin.
Lung fibrosis can develop if paraquat is swallowed or inhaled.
The symptoms of injury may be delayed. Prolonged skin contact will cause severe irritation.