Acute  Nasal Catarrh

Acute Rhinitis

Chronic Nasal Catarrh

Chronic Rhinitis

Neapolitan Disease

Syphilis. The French called it the Neapolitan or Italian disease.

Necrosis

Death of a bone or part of a bone; analogous to mortification of the soft parts. [Thomas1875]

Death of cells or tissues through injury or disease, especially in a localized area of the body. [Heritage]

African Cachexia. [Appleton1904]

Neoplasm

An abnormal new mass of tissue that serves no purpose. [Wordnet]

Nephria

Nephritis

Nephritis

Any of various acute or chronic inflammations of the kidneys, such as Bright's disease. [Heritage]

Chronic Nephritis

Inflammations of the kidneys. [Heritage]

Example from an 1889 New York State Death Certificate:

Nephrolith

A calculus formed in the kidney; Kidney Stone. [Heritage]

Nephrolithiasis

The presence of kidney stones (calculi) in the kidney. [Wordnet]

Nerve Pang

Neuralgia

Nervous Exhaustion

Nervous Prostration

Nervous Fever

A variety of typhus mitior of Cullen, but many considered as a distinct disease. It mostly begins with the loss of appetite, increased heat and vertigo; to which succeed nausea, vomiting, great languor, and pain in the head, which is variously described, by some like cold water pouring over the top, by others a sense of weight. The pulse, before little increased, now becomes quick, febrile, and tremulous; the tongue is covered with a white crust, and there is great anxiety about the precordia. Towards the seventh or eighth day, the vertigo is increased, and tinnitus aurium, cophosis, delirium, and a dry and tremulous tongue, take place. The disease mostly terminates about the fourteenth or twentieth day. [Hooper1843].

Typhus Mitior. [Dunglison1868].

Any fever characterized by decided derangement of the nervous system, especially typhus fever and typhoid fever. [Appleton1904]

Nervous Pain

Neuralgia

Nervous Prostration

An emotional disorder that leaves you exhausted and unable to work. [Wordnet]

Nervousness

Excessive excitability and irritability, with mental and physical unrest. [CancerWEB]

Nettlerash

Elevations of the cuticle, or wheals resembling the sting of the nettle. See Urticaria. [Hoblyn1855]

Nettlespringe

Urticaria

Neuralgia

A disease, the chief symptom of which is a very acute pain, exacerbating or intermitting, which follows the course of a nervous branch, extends to its ramifications, and seems therefore to be seated in the nerve. It seems to be independent of any structural lesion. --Dunglison. [Webster1913]

Neuralgia Femoropoplites

This is characterized by pain following the great sciatic nerve from the ischiatic notch to the ham, along the peroneal surface of the leg to the sole of the foot. It is often considered to be a form of rheumatism. [Dunglison1874]

Neuralgia of the Heart

Angina Pectoris

Neurasthenia

A psychological disorder characterized by chronic fatigue and weakness, loss of memory, and generalized aches and pains, formerly thought to result from exhaustion of the nervous system. No longer in scientific use. [Heritage]

Neuritis

Inflammation of a nerve or group of nerves, characterized by pain, loss of reflexes, and atrophy of the affected muscles. [Heritage]

Neuropathy

Affection of the nervous system or of a nerve. [Webster1913]

Neurosis

A mental or personality disturbance not attributable to any known neurological or organic dysfunction (syn: neuroticism, psychoneurosis) [Wordnet]

Nevoid Elephantiasis

Pachyderma

New World Spotted Fever

Rocky Mountain Spotted Fever

Noli Me Tangere

(touch me not). A name given by various writers to lupus. The disease is termed from its impatience of handling, and its being aggravated by most kinds of treatment. [Hoblyn1855]

Noma

Water canker; a form of sphacelus occurring generally in children. [Hoblyn1855]

A severe, often gangrenous inflammation of the mouth or genitals, occurring usually after an infectious disease and found most often in children in poor hygienic or malnourished condition; Gangrenous Stomatitis. [Heritage].

A spreading invasive gangrene chiefly of the lining of the cheek and lips that is usually fatal and occurs most often in persons severely debilitated by disease or profound nutritional deficiency —see Cancrum Oris. [Merriam]

Nonvenereal Syphilis

Syphilis caused by organisms closely related to Treponema pallidum; spread by personal, but not necessarily venereal, contact; usually acquired in childhood, most common in areas of poverty and overcrowding; rare in the United States; includes yaws, pinta and bejel. [CancerWEB]

Noodlepox

Syphilomania

Nosebleed

Epistaxis

Nostalgia

Homesickness; esp., a severe and sometimes fatal form of melancholia, due to homesickness. [Webster]

Numpost

Abscess