Your symptoms point to Otalgia. It means ear pain. This can have two origin (You mentioned that first one has been ruled out by the ENT specialist);
1) pain due to ear conditions.
2) referred pain due to other conditions which have diverse cause.
The ear conditions can be;
1) external otitis,
2) otitis media,
3) mastoiditis, and
4) auricular infections.
The conditions which can cause referred pain can be (these are main conditions);
1) Ramsay Hunt syndrome
2) Temporomandibular Disorders
3) Trigeminal Neuralgia
4) Dental infection or abscess
5) Labyrinthitis; internal ear infection
6) Sinusitis; sinus infection
7) Pharyngitis; throat infection
Referred otalgia (ear pain), which means pain in ear may not be related to ear diseases but remote or distant anatomical sites which share dual and common nerve supply (innervation) with the ear, and noxious stimuli to these areas may be perceived as ear (otogenic) pain. By definition, referred otalgia is the sensation of ear pain originating from a source outside the ear. Following are the causes which may be considered;
1) Chronic sinusitis; an MRI or the CT scan of sinuses would be suggested. Allergic fungal sinusitis, Barosinusitis should be looked for the cause.
2) Neck problems can also refer pain to the ears. These disorders include cervical osteoarthritis, cervical myofascial pain syndrome, and traumatic injuries. MRI of the neck spine would be advised.
3) Eagle syndrome, in which the elongated styloid process irritates branches of cranial nerves can cause ear pain. MRI of styloid process is needed, but this is not a common cause.
4) Laryngitis, esophagitis and gastroesophageal reflux disease (GERD) can be responsible for the bilateral ear pain which increases during migraine. Direct laryngoscopy, upper gastrointestinal endoscopy, 24 hours pH estimation of the esophagus would diagnose these issues. A therapeutic trial of antacids and acid blockers may also help in determining the cause and may give the clue for the further investigative work up.
5) Various neuralgias; Apart from trigeminal neuralgia; various other neuralgias can cause the ear pain. Sphenopalatine and vidian neuralgias cause ear. Glossopharyngeal neuralgia, which causes a phantom tonsillar pain, may also cause otalgia.
6) Meniere disease.
7) Tympanic tube dysfunctions.
8) Dental disorders of malocclusion.
9) TMJ joint issue.
Following investigations, if not done would be advised with the above recommended investigations and medical imaging;
1) Thyroid function and erythrocyte sedimentation rate (ESR).
2) Antibodies for thyroiditis.
3) Vestibulocochlear testing.
5) Nasal endoscopy.
6) Upper aerodigestive tract endoscopy,
Consulting an ENT specialist or a neurologist working in a hospital attached to a medical school would be ideal. These doctors / specialists work in tandem and as a team to ascertain the cause. Various numbing medications can be locally applied or injected (like sinus, larynx, pharynx etc) and that way specific cause of ear pain can be diagnosed or ruled out in these medical research institutions.
Please read this reference resource:
This mentions: an unusual case of large tonsillolith presented with acute otalgia. Since the tonsils and tonsillar fossa are supplied by the glossopharyngeal nerve, any irritation or pain can be referred to the ear along the tympanic branch of the glossopharyngeal (Jacobson's) nerve.
The ear receives an extensive sensory innervation via four cranial nerves (V, VII, IX, and X) and two spinal segments (C2 and C3). The most common causes are temporomandibular joint syndrome, pharyngitis, dental disease, and cervical spine arthritis.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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