Celebrity clinic; Vital health.
He now carries a syringe of adrenaline with him at all times in case it happens again.
About one in four people in the UK will be affected by an allergy at some time in their life. Common culprits are eggs, peanuts, medications, pets and bee and wasp venom, but many other substances can also cause allergic reactions.
Allergy usually happens immediately on contact. It can be mild and harmless or more serious and even life-threatening.
The symptoms are runny nose and eyes, itchy rash, tingling and swelling of the mouth and throat, which can prevent breathing, and in severe cases like Liam's, a whole body reaction.
This could lead to cardiac arrest. Anaphylaxis is a medical emergency.
It causes people to suddenly have wheezing and difficulty breathing, and a swollen mouth.
It rapidly escalates to collapse and losing consciousness.
If you suspect a person is in anaphylaxis call 999. Then see if they have an adrenaline syringe and administer it, and do chest compressions if they stop breathing - you could save their life.
Anaphylaxis is a medical emergency. Call 999