The scientific interest of this study is to improve post-operative comfort in patients after thyroid surgery using simple, inexpensive techniques. The investigator expects that local applications of ice or cortisone aerosols will reduce swallowing discomfort and control post-operative pain (POP). The investigator hopes that local cryotherapy will decrease post-operative oedema (vasoconstriction) and the volume of liquid drained (action on the serous fluid at the site of the thyroidectomy).

Inclusion Criteria:

• Patients about to undergo total thyroidectomy by cervicotomy
• Single surgeon: Dr Osmak-Tizon Liliana
• Patients who have provided written consent to take part in the research
• Hospitalized in the endocrine surgery unit
• Whose mental and physical state allows them to participate in the quantification of a symptom using a Visual Analogue Scale(VAS)

Exclusion Criteria:

• Patients under 18 or adults under guardianship
• Patients about to undergo unilateral thyroid surgery (thyroid lobectomy)
• Patient who have had parathyroid surgery
• History of cervicotomy
• Intolerance to, contra-indication for or allergy to any of the treatments tested.
• Pregnant or breast-feeding women
• Patients without national health insurance cover