Poisoning is when a person is exposed to a substance that can damage their health or endanger their life.
In 2013-14, almost 150,000 people were admitted to hospital with poisoning in England.
Most cases of poisoning happen at home, and children under 5 have the highest risk of accidental poisoning.
In around 1 in 4 reported cases, the person intentionally poisoned themselves as a deliberate act of self-harm.
The symptoms of poisoning will depend on the type of poison and the amount taken in, but general things to look out for include:
If a child suddenly develops these symptoms, they may have been poisoned, particularly if they're drowsy and confused.
If you suspect that someone has taken an overdose or has been poisoned, don't try to treat them yourself. Get medical help immediately.
If they don't appear to be seriously ill, call NHS 111 for advice.
If they're showing signs of being seriously ill, such as vomiting, loss of consciousness, drowsiness or seizures (fits), call 999 to request an ambulance or take the person to your local A&E department.
In serious cases, it may be necessary for the person to stay in hospital for treatment. Most people admitted to hospital because of poisoning will survive.
Read more about what to do if you think someone has been poisoned.
Poisons can be swallowed, absorbed through the skin, injected, inhaled or splashed into the eyes.
Other potential poisons include:
Snakes and insects, such as wasps and bees, aren't poisonous, but their bites or stings can contain venom (toxin).
Read more about the causes of poisoning.
There are several things you can do to reduce your or your child's risk of poisoning.
These include carefully reading the patient information leaflet that comes with your medication and ensuring that any poisonous substances are locked away out of the sight and reach of your children.
Read more about preventing poisoning.