While there are some similarities between the two there are some key differences, health authorities say.

"COVID-19 and seasonal allergies share some symptoms, but also some key differences," a Western NSW Local Health District (LHD) spokeswoman said.

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"For example, COVID-19 can cause fever, which is not a common symptom of seasonal allergies."

Some of the similar symptoms can include: cough; shortness of breath or difficulty breathing*; fatigue; headache; sore throat; congestion or runny nose.

The LHD spokeswoman said given some of the symptoms of COVID-19 and seasonal allergies are similar, it is best to contact your GP if you're unsure.

"Most GPs are able to provide telehealth consultations for problems like these," she said.

NSW Health said if you have any possible COVID-19 symptoms, even if you suspect it is just your first allergy attack of the season, you need to immediately get tested for COVID-19 to confirm your diagnosis.

"If you normally have seasonal allergies and you experience any new symptoms or a change in your symptoms, you should also get tested for COVID-19 straight away," they said.

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The LHD spokesperson said the people who suffer from seasonal allergies should continue their current treatment regime to minimise symptoms.

"You should also consider talking with your GP about having an effective treatment plan for your seasonal allergies and/or asthma before the hay fever season begins," she said.

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* Seasonal allergies do not usually cause shortness of breath or difficulty breathing, unless a person has a respiratory condition such as asthma that can be triggered by exposure to pollen, NSW Health says.

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