There are a number of essential oils for sore throat that the family herbalist can use to both help the body deal with the problem and to help prevent future sore throats.
Sore throat is pain in the back of the throat. The pain can be severe and is usually worsened by swallowing. Many people with sore throat refuse to eat or drink. Sometimes pain is also felt in the ear (nerves to the back of the throat run very close to nerves from the ear). – MSD Manual 
What Causes a Sore Throat?
Your Doctor’s View
A sore throat results from infection. The most common infection is tonsillopharyngitis an infection of the tonsils (patches of lymphoid tissue at the back of the throat) and the throat (pharynx). Doctors may use the term tonsillitis when the tonsils are particularly inflamed or the term pharyngitis when the tonsils are not particularly inflamed or when people who have no tonsils have a sore throat. 
Tonsillopharyngitis is usually caused by a virus, typically one of the same viruses that causes the common cold. Most common colds begin with a mild sore throat. About 10% of sore throats in adults (and slightly more in children) are caused by a type of Streptococcus bacteria (streptococci). Such streptococcal infections are often termed strep throat. Strep throat is unusual in children younger than 2 years.
A sore throat caused by a viral infection usually lasts five to seven days and doesn’t require medical treatment. However, to ease pain and fever, many people turn to acetaminophen (Tylenol, others) or other mild pain relievers. Use acetaminophen for the shortest time possible and follow label directions to avoid side effects. If your sore throat is caused by a bacterial infection, your doctor will prescribe antibiotics. 
The Family Herbalist’s View
A sore throat is an indication of an impaired immune system. This results when the body is attempting to eliminate toxins, especially from the lymph system and the intestinal tract. The family herbalist will first and foremost look at improving elimination and supporting the immune system to prevent future infections.
Next we look at assisting the body to deal with the current infection. Treatment with essential oils is aimed at reducing pain and inflammation, killing the virus or bacteria, and uplifting the spirit which aids healing.
How To Use Essential Oils for Sore Throat Treatments
Gargle (1 to 2 drops essential oil)
Add essential oil to a teaspoon of honey.
Dissolve the blend in 30 ml (2 tablespoons) of warm water.
Gargle a small amount for 20 seconds and spit out.
Do not swallow.
Essential Oil Gargle Blend for Sore Throat
This blend is also effective for coughs.
2 teaspoons cider vinegar
1 drop sandalwood or eucalyptus
1 drop lemon
Blends oils and vinegar. Top up with 1 teacup warm water, then stir in 1 teaspoon honey. Gargle 2-3 times daily, but not swallow.
Steam Inhalation (1 to 2 drops essential oil)
Add essential oil to a small bowl of steaming water.
Cover your head and the bowl with a towel, making sure that you are at a comfortable distance above the bowl.
Inhale deeply with your nose, keeping your eyes closed.
Raise the towel and exhale slowly through your mouth, then lower the towel and inhale deeply through your nose.
Continue this procedure for 10 – 15 minutes or until the smell is gone.
Massage Oil (3 to 6 drops essential oil)
Start with a ½ percent solution. Add 3 drops of essential oil to every 30 ml ( 2 tablespoons of carrier oil)
If no irritation results after the initial application you can increase to a 1% solution. Add 6 drops of essential oil to every 30 ml ( 2 tablespoons of carrier oil).
Use an essential oil diffuser (many types are available). Most rely on gentle heat to activate the essential oil. Make sure you follow the instructions of your diffuser. Use the diffuser with uplifting oils to lift the mind and spirit.
Top 5 Essential Oils for Sore Throat
Clove – Syzigium aromaticum syn Eugenia caryophyllata
A native of Indonesia, Tanzania, Madagascar and Ceylon. Two types of clove oil with similar characteristics are obtained from its blossoms and leaves through distillation. The blossom oil is more expensive and has a warmer, spicier, sweeter scent. By contrast, the leaf oil is not as fruity.
Clove is very antiseptic and pain-relieving. Thus, the essential oil is used is many pain-relieving treatments. It’s scent is familiar to anyone who has been to the dentist.
Clary Sage – Salvia sclarea
Cultivated in France, Spain and Russia. The essential oil is derived through distillation from the blossoms of the herb. It yields a thin light to yellowish essential oil.
Clary sage has bitter, astringent and relaxing properties.
Eucalyptus – Eucalyptus globulus
Native to Australia but widely cultivated in the southern hemisphere. It was widely planted to dry out swampy ground, notably in Italy and California. An important timber species, used for the keels of ships in the 19th century. Widely used as a flavouring in pharmaceutical products and in spot removers for oil and grease.
The essential oil is obtained from the leaves and small twigs. It is generally known for its strong antiseptic and healing effect on infections of the respiratory system.
Lavender – Lavendula officinalis, L.vera
Lavender grows throughout the Mediterranean region as well as in England, Russia and Australia. The fresh stems and flower buds are used to make the essential oil.
Lavender essential oil is antibacterial, pain-relieving, healing for wounds, soothing for skin diseases, deodorizing, antiseptic, fungicidal, rejuvenating and anti-inflammatory. Headaches disappear with cold lavender compresses. In addition Lavender strengthens the effects of other oils when used in blends.
Peppermint – Mentha piperita
This familiar herb is grown worldwide. Its thin, clear essential oil is derived from the herb through distillation. It contains menthol, a crystalline substance that is known for its ability to open the breathing passages.
Its slightly antiseptic, anti-inflammatory and toning properties are of use in treating sore throat.
More Suggested Essential Oils for Sore Throat
Essential oils with pain killing (analgesic), anti-inflammatory and anti-microbial properties will all be helpful in treating sore throat.
Pharyngitis and Strep Throat
Bergamot, Clary Sage, Eucalyptus, Geranium, Ginger, Lavender, Lemon, Peppermint, Pine, Sandalwood, Tea Tree.
Laryngitis and Hoarseness
Clary Sage, Eucalyptus, Frankincense, Lavender, Lemon, Sandalwood.
Do not take essential oils internally.
Do not take essential oils during pregnancy.
Do not take essential oils if you suffer from asthma.
People with epilepsy should consult an aromatherapist before using essential oils.
If you are undergoing homeopathic treatment, do seek the advice of your homeopath before embarking on the use of essential oils for sore throat.
The usual safety precautions for using herbal remedies also applies to essential oils. Refresh your memory if you need to.
 MSD Manual Consumer Version https://www.msdmanuals.com/home/ear,-nose,-and-throat-disorders/symptoms-of-nose-and-throat-disorders/
 Mayo Clinic Sore Throat
More Essential Oil Guides:
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The information provided is for educational purposes only. Used as a reference, not as a means of diagnosis and/or treatment, it can act as a guide, but only with the cooperation and advise of trained professionals. It is not within the scope of any collection of information to perform the medical duties of the health care profession.
Always consult with your physician or other qualified healthcare provider before embarking on a new wellness program. If you are pregnant or lactating, taking medications, have a health condition or are planning a medical procedure, you should consult your doctor or other healthcare provider.