Eustachian Tube Dysfunction: This condition is a common cause of ear pressure and tinnitus, especially if the symptoms are unilateral and of recent onset. The Eustachian tube helps regulate air pressure in the ear, and dysfunction can lead to feelings of fullness or pressure and tinnitus.

Middle Ear Effusion: Fluid accumulation in the middle ear can cause ear pressure and tinnitus. This condition can be secondary to an upper respiratory infection, allergies, or other causes of Eustachian tube dysfunction.
Acute Otitis Media: An infection of the middle ear can present with ear pain, pressure, and tinnitus. The presence of fever, otalgia, and a bulging tympanic membrane on examination would support this diagnosis.
Wax Impaction: Earwax can sometimes cause a feeling of fullness or pressure in the ear and tinnitus if it obstructs the ear canal.

Acoustic Neuroma: Although rare, this benign tumor affecting the nerve connecting the inner ear to the brain can cause unilateral tinnitus and hearing loss. Early diagnosis is crucial for effective management.
Temporal Bone Fracture: Trauma to the temporal bone can cause tinnitus, ear pressure, and other neurological symptoms. A history of head trauma would increase the suspicion for this condition.
Meniere's Disease: Characterized by episodes of vertigo, tinnitus, hearing loss, and ear fullness, Meniere's disease can present with tinnitus and ear pressure. However, vertigo is a key distinguishing feature.

Otosclerosis: A condition where abnormal bone growth in the middle ear causes hearing loss and can lead to tinnitus and ear fullness.
Autoimmune Inner Ear Disease: An autoimmune condition that can cause sudden hearing loss, tinnitus, and ear fullness, often in both ears but can be asymmetric.
Vestibular Schwannoma: Similar to acoustic neuroma but specifically affecting the vestibular nerve, causing balance issues in addition to tinnitus and hearing loss.